deploy: support deploying sidecars in same pod as driver

The kubernetes-x.yy deployments now use the same pod for driver and
sidecars, which is the usual way of deploying them.

The alternative "-prow" deployments use separate pods for them to test
that the individual RBAC rules are correct.

deploy/kubernetes-1.18-test/README.md

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+The deployment for Kubernetes 1.18 uses CSIDriver v1 and
+thus is incompatible with Kubernetes < 1.18.
+
+It uses separate pods and service accounts for each sidecar. This is
+not how they would normally be deployed. It gets done this way to test
+that the individual RBAC rules are correct.

deploy/kubernetes-1.18-test/deploy.sh

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+../util/deploy-hostpath.sh

deploy/kubernetes-1.18-test/destroy.sh

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+../util/destroy-hostpath.sh

deploy/kubernetes-1.18-test/hostpath/csi-hostpath-driverinfo.yaml

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+apiVersion: storage.k8s.io/v1
+kind: CSIDriver
+metadata:
+  name: hostpath.csi.k8s.io
+  labels:
+    app.kubernetes.io/instance: hostpath.csi.k8s.io
+    app.kubernetes.io/part-of: csi-driver-host-path
+    app.kubernetes.io/name: hostpath.csi.k8s.io
+    app.kubernetes.io/component: csi-driver
+spec:
+  # Supports persistent and ephemeral inline volumes.
+  volumeLifecycleModes:
+  - Persistent
+  - Ephemeral
+  # To determine at runtime which mode a volume uses, pod info and its
+  # "csi.storage.k8s.io/ephemeral" entry are needed.
+  podInfoOnMount: true

deploy/kubernetes-1.18-test/hostpath/csi-hostpath-plugin.yaml

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+kind: StatefulSet
+apiVersion: apps/v1
+metadata:
+  name: csi-hostpathplugin
+  labels:
+    app.kubernetes.io/instance: hostpath.csi.k8s.io
+    app.kubernetes.io/part-of: csi-driver-host-path
+    app.kubernetes.io/name: csi-hostpathplugin
+    app.kubernetes.io/component: plugin
+spec:
+  serviceName: "csi-hostpathplugin"
+  # One replica only:
+  # Host path driver only works when everything runs
+  # on a single node. We achieve that by starting it once and then
+  # co-locate all other pods via inter-pod affinity
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/instance: hostpath.csi.k8s.io
+      app.kubernetes.io/part-of: csi-driver-host-path
+      app.kubernetes.io/name: csi-hostpathplugin
+      app.kubernetes.io/component: plugin
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/instance: hostpath.csi.k8s.io
+        app.kubernetes.io/part-of: csi-driver-host-path
+        app.kubernetes.io/name: csi-hostpathplugin
+        app.kubernetes.io/component: plugin
+    spec:
+      serviceAccountName: csi-external-health-monitor-controller
+      containers:
+        - name: hostpath
+          image: k8s.gcr.io/sig-storage/hostpathplugin:v1.6.2
+          args:
+            - "--drivername=hostpath.csi.k8s.io"
+            - "--v=5"
+            - "--endpoint=$(CSI_ENDPOINT)"
+            - "--nodeid=$(KUBE_NODE_NAME)"
+          env:
+            - name: CSI_ENDPOINT
+              value: unix:///csi/csi.sock
+            - name: KUBE_NODE_NAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
+          securityContext:
+            privileged: true
+          ports:
+          - containerPort: 9898
+            name: healthz
+            protocol: TCP
+          livenessProbe:
+            failureThreshold: 5
+            httpGet:
+              path: /healthz
+              port: healthz
+            initialDelaySeconds: 10
+            timeoutSeconds: 3
+            periodSeconds: 2
+          volumeMounts:
+            - mountPath: /csi
+              name: socket-dir
+            - mountPath: /var/lib/kubelet/pods
+              mountPropagation: Bidirectional
+              name: mountpoint-dir
+            - mountPath: /var/lib/kubelet/plugins
+              mountPropagation: Bidirectional
+              name: plugins-dir
+            - mountPath: /csi-data-dir
+              name: csi-data-dir
+            - mountPath: /dev
+              name: dev-dir
+
+        - name: liveness-probe
+          volumeMounts:
+          - mountPath: /csi
+            name: socket-dir
+          image: k8s.gcr.io/sig-storage/livenessprobe:v2.2.0
+          args:
+          - --csi-address=/csi/csi.sock
+          - --health-port=9898
+
+        - name: csi-external-health-monitor-agent
+          image: k8s.gcr.io/sig-storage/csi-external-health-monitor-agent:v0.2.0
+          args:
+            - "--v=5"
+            - "--csi-address=$(ADDRESS)"
+          env:
+            - name: NODE_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+            - name: ADDRESS
+              value: /csi/csi.sock
+          imagePullPolicy: "IfNotPresent"
+          volumeMounts:
+            - name: socket-dir
+              mountPath: /csi
+
+        - name: csi-external-health-monitor-controller
+          image: k8s.gcr.io/sig-storage/csi-external-health-monitor-controller:v0.2.0
+          args:
+            - "--v=5"
+            - "--csi-address=$(ADDRESS)"
+            - "--leader-election"
+          env:
+            - name: ADDRESS
+              value: /csi/csi.sock
+          imagePullPolicy: "IfNotPresent"
+          volumeMounts:
+            - name: socket-dir
+              mountPath: /csi
+
+        - name: node-driver-registrar
+          image: k8s.gcr.io/sig-storage/csi-node-driver-registrar:v2.0.1
+          args:
+            - --v=5
+            - --csi-address=/csi/csi.sock
+            - --kubelet-registration-path=/var/lib/kubelet/plugins/csi-hostpath/csi.sock
+          securityContext:
+            # This is necessary only for systems with SELinux, where
+            # non-privileged sidecar containers cannot access unix domain socket
+            # created by privileged CSI driver container.
+            privileged: true
+          env:
+            - name: KUBE_NODE_NAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
+          volumeMounts:
+          - mountPath: /csi
+            name: socket-dir
+          - mountPath: /registration
+            name: registration-dir
+          - mountPath: /csi-data-dir
+            name: csi-data-dir
+
+      volumes:
+        - hostPath:
+            path: /var/lib/kubelet/plugins/csi-hostpath
+            type: DirectoryOrCreate
+          name: socket-dir
+        - hostPath:
+            path: /var/lib/kubelet/pods
+            type: DirectoryOrCreate
+          name: mountpoint-dir
+        - hostPath:
+            path: /var/lib/kubelet/plugins_registry
+            type: Directory
+          name: registration-dir
+        - hostPath:
+            path: /var/lib/kubelet/plugins
+            type: Directory
+          name: plugins-dir
+        - hostPath:
+            # 'path' is where PV data is persisted on host.
+            # using /tmp is also possible while the PVs will not available after plugin container recreation or host reboot
+            path: /var/lib/csi-hostpath-data/
+            type: DirectoryOrCreate
+          name: csi-data-dir
+        - hostPath:
+            path: /dev
+            type: Directory
+          name: dev-dir

deploy/kubernetes-1.18-test/hostpath/csi-hostpath-snapshotclass.yaml

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+apiVersion: snapshot.storage.k8s.io/v1beta1
+kind: VolumeSnapshotClass
+metadata:
+  name: csi-hostpath-snapclass
+  labels:
+    app.kubernetes.io/instance: hostpath.csi.k8s.io
+    app.kubernetes.io/part-of: csi-driver-host-path
+    app.kubernetes.io/name: csi-hostpath-snapclass
+    app.kubernetes.io/component: volumesnapshotclass
+driver: hostpath.csi.k8s.io #csi-hostpath
+deletionPolicy: Delete

deploy/kubernetes-1.18-test/hostpath/csi-hostpath-testing.yaml

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+# WARNING: this is only for testing purposes. Do not install in a production
+# cluster.
+#
+# This exposes the hostpath's Unix domain csi.sock as a TCP port to the
+# outside world. The mapping from Unix domain socket to TCP is done
+# by socat.
+#
+# This is useful for testing with csi-sanity or csc.
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: hostpath-service
+  labels:
+    app.kubernetes.io/instance: hostpath.csi.k8s.io
+    app.kubernetes.io/part-of: csi-driver-host-path
+    app.kubernetes.io/name: csi-hostpath-socat
+    app.kubernetes.io/component: socat
+spec:
+  type: NodePort
+  selector:
+    app.kubernetes.io/instance: hostpath.csi.k8s.io
+    app.kubernetes.io/part-of: csi-driver-host-path
+    app.kubernetes.io/name: csi-hostpath-socat
+    app.kubernetes.io/component: socat
+  ports:
+  - port: 10000 # fixed port inside the pod, dynamically allocated port outside
+---
+kind: StatefulSet
+apiVersion: apps/v1
+metadata:
+  name: csi-hostpath-socat
+  labels:
+    app.kubernetes.io/instance: hostpath.csi.k8s.io
+    app.kubernetes.io/part-of: csi-driver-host-path
+    app.kubernetes.io/name: csi-hostpath-socat
+    app.kubernetes.io/component: socat
+spec:
+  serviceName: "csi-hostpath-socat"
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/instance: hostpath.csi.k8s.io
+      app.kubernetes.io/part-of: csi-driver-host-path
+      app.kubernetes.io/name: csi-hostpath-socat
+      app.kubernetes.io/component: socat
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/instance: hostpath.csi.k8s.io
+        app.kubernetes.io/part-of: csi-driver-host-path
+        app.kubernetes.io/name: csi-hostpath-socat
+        app.kubernetes.io/component: socat
+    spec:
+      affinity:
+        podAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+          - labelSelector:
+              matchExpressions:
+              - key: app.kubernetes.io/instance
+                operator: In
+                values:
+                  - hostpath.csi.k8s.io
+            topologyKey: kubernetes.io/hostname
+      containers:
+        - name: socat
+          image: alpine/socat:1.0.3
+          args:
+            - tcp-listen:10000,fork,reuseaddr
+            - unix-connect:/csi/csi.sock
+          securityContext:
+            # This is necessary only for systems with SELinux, where
+            # non-privileged sidecar containers cannot access unix domain socket
+            # created by privileged CSI driver container.
+            privileged: true
+          volumeMounts:
+          - mountPath: /csi
+            name: socket-dir
+      volumes:
+        - hostPath:
+            path: /var/lib/kubelet/plugins/csi-hostpath
+            type: DirectoryOrCreate
+          name: socket-dir

deploy/kubernetes-1.18-test/test-driver.yaml

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+# This file describes how to test this deployment of the CSI hostpath driver
+# using the Kubernetes 1.17 E2E test suite. For details see:
+# https://github.com/kubernetes/kubernetes/tree/v1.17.0/test/e2e/storage/external
+
+StorageClass:
+  FromName: true
+SnapshotClass:
+  FromName: true
+DriverInfo:
+  Name: hostpath.csi.k8s.io
+  SupportedSizeRange:
+    Min: 1Mi
+  Capabilities:
+    block: true
+    controllerExpansion: true
+    exec: true
+    multipods: true
+    nodeExpansion: true
+    persistence: true
+    singleNodeVolume: true
+    snapshotDataSource: true
+    topology: true
+InlineVolumes:
+- shared: true