generate_pv_pvcs_list: set claimRef for NFS volumes

claimRef would ensure no other PVC can bind to a specified PV.
All PVCs created here are done in default namespace

roles/lib_utils/action_plugins/generate_pv_pvcs_list.py

@@ -45,7 +45,7 @@ class ActionModule(ActionBase):
         volume, size, labels, _, access_modes = self.build_common(varname=varname)
         directory = self.get_templated(str(varname) + '_nfs_directory')
         path = directory + '/' + volume
-        return dict(
+        result = dict(
             name="{0}-volume".format(volume),
             capacity=size,
             labels=labels,
@@ -54,6 +54,11 @@ class ActionModule(ActionBase):
                 nfs=dict(
                     server=host,
                     path=path)))
+        # Add claimref for NFS as default storageclass can be different
+        create_pvc = self.task_vars.get(str(varname) + '_create_pvc')
+        if create_pvc and self._templar.template(create_pvc):
+            result['storage']['claimName'] = "{0}-claim".format(volume)
+        return result
 
     def build_pv_openstack(self, varname=None):
         """Build pv dictionary for openstack storage type"""

roles/openshift_persistent_volumes/templates/persistent-volume-claim.yml.j2

@@ -18,7 +18,7 @@ items:
     resources:
       requests:
         storage: "{{ claim.capacity }}"
-{% if claim.storageclass %}
+{% if claim.storageclass is not none %}
     storageClassName: "{{ claim.storageclass }}"
 {% endif %}
 {% endfor %}

roles/openshift_persistent_volumes/templates/persistent-volume.yml.j2

@@ -18,4 +18,9 @@ items:
       storage: "{{ volume.capacity }}"
     accessModes: {{ volume.access_modes | lib_utils_to_padded_yaml(2, 2) }}
     {{ (volume.storage.keys() | list)[0] }}: {{ volume.storage[(volume.storage.keys() | list)[0]] | lib_utils_to_padded_yaml(3, 2) }}
+{% if 'claimName' in volume.storage %}
+    claimRef:
+      name: {{ volume.storage.claimName }}
+      namespace: default
+{% endif %}
 {% endfor %}