Add kubelet and kubeproxy configuration in KubeadmConfigSpec

[accepting]

User Story

KubeadmConfigSpec should have the ability to config kubelet and kubeproxy parameters that kubeadm supports.

Detailed Description

When using kubeadm to setup a cluster, we need to config kubelet and kubeproxy parameters. But with the current version of KubeadmConfigSpec we cannot do that. We hope KubeadmConfigSpec can be added another two fields:

type KubeadmConfigSpec struct {
        ...
	KubeProxyConfiguration *kubeadmv1beta1.KubeProxyConfiguration `json:"kubeProxyConfiguration,omitempty"`
        KubeProxyConfiguration *kubeadmv1beta1.KubeProxyConfiguration `json:"kubeProxyConfiguration,omitempty"`

With this feature, we can config bootstrap as follows

spec:
  template:
    apiVersion: xxxx
    kind: Bootstrap
    spec:
      clusterConfiguration:
        apiVersion: kubeadm.k8s.io/v1beta1
        kind: ClusterConfiguration
        ...
      joinConfiguration:
        apiVersion: kubeadm.k8s.io/v1beta1
        kind: JoinConfiguration
        ...
      initConfiguration:
        apiVersion: kubeadm.k8s.io/v1beta1
        kind: InitConfiguration
        ...
      kubeletConfiguration:
        apiVersion: kubelet.config.k8s.io/v1beta1
        kind: KubeletConfiguration
        systemReserved:
          cpu: 500m
          memory: 500M
        systemReservedCgroup: "cgroupfs"
          cgroupDriver: "cgroupfs"
          configMapAndSecretChangeDetectionStrategy: "Cache"
          readOnlyPort: 10255
      kubeProxyConfiguration:
         apiVersion: kubeproxy.config.k8s.io/v1alpha1
         kind: KubeProxyConfiguration
         metricsBindAddress: "0.0.0.0:10249"

/kind feature

[accepting]

@chuckha

[ncdc]

This was requested in #1584 - closing as a duplicate.
/close

[k8s-ci-robot]

@ncdc: Closing this issue.

In response to this:

This was requested in #1584 - closing as a duplicate.
/close

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