Add etcd_data_dir variable to the kubeadm config (#5263)

roles/kubernetes/master/templates/kubeadm-config.v1beta1.yaml.j2

@@ -39,7 +39,7 @@ etcd:
   local:
     imageRepository: "{{ etcd_image_repo | regex_replace("/etcd$","") }}"
     imageTag: "{{ etcd_image_tag }}"
-    dataDir: "/var/lib/etcd"
+    dataDir: "{{ etcd_data_dir }}"
     extraArgs:
       metrics: {{ etcd_metrics }}
       election-timeout: "{{ etcd_election_timeout }}"

roles/kubernetes/master/templates/kubeadm-config.v1beta2.yaml.j2

@@ -42,7 +42,7 @@ etcd:
   local:
     imageRepository: "{{ etcd_image_repo | regex_replace("/etcd$","") }}"
     imageTag: "{{ etcd_image_tag }}"
-    dataDir: "/var/lib/etcd"
+    dataDir: "{{ etcd_data_dir }}"
     extraArgs:
       metrics: {{ etcd_metrics }}
       election-timeout: "{{ etcd_election_timeout }}"