Fix manila storageclass upgrade

`provisioner` is immutable. for PV.
PV in cluster that build with storageclass that
change only provisioner will not be able to upgrade.

Signed-off-by: ricolin <[email protected]>

Author: ricolin

magnum_cluster_api/resources.py

@@ -338,7 +338,7 @@ def get_object(self) -> dict:
                                 "allowVolumeExpansion": True,
                                 "kind": objects.StorageClass.kind,
                                 "metadata": {
-                                    "name": "share-%s"
+                                    "name": "share-nfs-%s"
                                     % utils.convert_to_rfc1123(st.name),
                                 },
                                 "provisioner": "nfs.manila.csi.openstack.org",