Move kubernetes/master to kubernetes/control-plane (#7218)

This is a small step to replace "master" with "control-plane" in
Kubespray project.

roles/kubernetes/control-plane/templates/secrets_encryption.yaml.j2

@@ -0,0 +1,11 @@
+kind: EncryptionConfig
+apiVersion: v1
+resources:
+  - resources:
+{{ kube_encryption_resources|to_nice_yaml|indent(4, True) }}
+    providers:
+    - {{ kube_encryption_algorithm }}:
+        keys:
+        - name: key
+          secret: {{ kube_encrypt_token | b64encode }}
+    - identity: {}