add Cinder allowVolumeExpansion option (#4415)

roles/kubernetes-apps/persistent_volumes/openstack/templates/openstack-storage-class.yml.j2

@@ -11,4 +11,5 @@ parameters:
 {% for key, value in (class.parameters | default({})).items() %}
   "{{ key }}": "{{ value }}"
 {% endfor %}
+allowVolumeExpansion: {{ expand_persistent_volumes }}
 {% endfor %}

roles/kubernetes/master/defaults/main/main.yml

@@ -83,6 +83,7 @@ kube_apiserver_admission_control:
   - LimitRanger
   - ServiceAccount
   - DefaultStorageClass
+  - PersistentVolumeClaimResize
   - >-
       {%- if kube_version is version('v1.9', '<') -%}
       GenericAdmissionWebhook

roles/kubespray-defaults/defaults/main.yaml

@@ -277,6 +277,7 @@ persistent_volumes_enabled: false
 cephfs_provisioner_enabled: false
 ingress_nginx_enabled: false
 cert_manager_enabled: false
+expand_persistent_volumes: false
 
 ## When OpenStack is used, Cinder version can be explicitly specified if autodetection fails (Fixed in 1.9: https://github.com/kubernetes/kubernetes/issues/50461)
 # openstack_blockstorage_version: "v1/v2/auto (default)"