Add Kubelet config, remove deprecated flags and fix minor bugs (#4724)

* Add kubelet config

* Change kubelet_authorization_mode_webhook to true

* Fix lint

* Sync env file

* Refactor the kubernetes node folder

* Remove deprecated flag and fix lint

roles/kubernetes/kubeadm/templates/kubeadm-client.conf.v1beta1.j2

@@ -1,3 +1,4 @@
+---
 apiVersion: kubeadm.k8s.io/v1beta1
 kind: JoinConfiguration
 discovery:
@@ -8,7 +9,8 @@ discovery:
     apiServerEndpoint: {{ kubeadm_discovery_address | replace("https://", "")}}
 {% endif %}
     token: {{ kubeadm_token }}
-    unsafeSkipCAVerification: true
+    caCertHashes:
+    - sha256:{{ kubeadm_ca_hash.stdout }}
   timeout: {{ discovery_timeout }}
   tlsBootstrapToken: {{ kubeadm_token }}
 caCertPath: {{ kube_cert_dir }}/ca.crt