Make sure that we use rslave mount propagation

This will ensure that any new plugins added to controller
will not require pod restart

roles/openshift_control_plane/files/controller.yaml

@@ -35,6 +35,7 @@ spec:
        name: signature-import
      - mountPath: /usr/libexec/kubernetes/kubelet-plugins
        name: kubelet-plugins
+       mountPropagation: "HostToContainer"
     livenessProbe:
       httpGet:
         scheme: HTTPS

roles/openshift_control_plane/templates/master.yaml.v1.j2

@@ -86,7 +86,7 @@ kubernetesMasterConfig:
 {% if openshift_is_atomic | bool %}
     flex-volume-plugin-dir:
     - "{{ openshift_flexvolume_container_directory_default }}/volume/exec"
-{% end %}
+{% endif %}
 {% if openshift_master_use_persistentlocalvolumes | bool %}
     feature-gates:
     - PersistentLocalVolumes=true