Update cluster autoscaler to 1.20.0

dev/versions.md

@@ -162,10 +162,9 @@ see https://github.com/moby/moby/issues/39302#issuecomment-639687466_
 1. Find the latest patch release for our current version of k8s (e.g. k8s v1.17 -> cluster-autocluster v1.17.3)
    on [GitHub](https://github.com/kubernetes/autoscaler/releases) and check the changelog
 1. Update the base image in `images/cluster-autoscaler/Dockerfile` to the repository URL shown in the GitHub release
-1. In the [GitHub Repo](https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/aws), set
-   the tree to the tag for the chosen release, and
-   open `cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yaml` (
-   e.g. <https://github.com/kubernetes/autoscaler/blob/cluster-autoscaler-1.16.5/cluster-autoscaler/cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yaml>)
+1. In the [GitHub Repo](https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/cloudprovider/aws),
+   set the tree to the tag for the chosen release, and open `cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yaml`
+   (e.g. <https://github.com/kubernetes/autoscaler/blob/cluster-autoscaler-1.20.0/cluster-autoscaler/cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yaml>)
 1. Resolve merge conflicts with the template in `manager/manifests/cluster-autoscaler.yaml.j2`
 
 ## FluentBit

images/cluster-autoscaler/Dockerfile

@@ -1 +1 @@
-FROM k8s.gcr.io/autoscaling/cluster-autoscaler:v1.18.3
+FROM k8s.gcr.io/autoscaling/cluster-autoscaler:v1.20.0

manager/manifests/cluster-autoscaler.yaml.j2

@@ -12,9 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Source: https://github.com/kubernetes/autoscaler/blob/cluster-autoscaler-1.17.3/cluster-autoscaler/cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yaml
+# Source: https://github.com/kubernetes/autoscaler/blob/cluster-autoscaler-1.20.0/cluster-autoscaler/cloudprovider/aws/examples/cluster-autoscaler-autodiscover.yaml
 
----
 apiVersion: v1
 kind: ServiceAccount
 metadata:
@@ -189,7 +188,7 @@ spec:
             - --node-group-auto-discovery=asg:tag=k8s.io/cluster-autoscaler/enabled,k8s.io/cluster-autoscaler/{{ config['cluster_name'] }}
           volumeMounts:
             - name: ssl-certs
-              mountPath: /etc/ssl/certs/ca-certificates.crt
+              mountPath: /etc/ssl/certs/ca-certificates.crt #/etc/ssl/certs/ca-bundle.crt for Amazon Linux Worker Nodes
               readOnly: true
           imagePullPolicy: "Always"
       volumes: