Deprecate support for VMWare Datastore store driver

... because the driver was deprecated during this cycle.

Depends-on: https://review.opendev.org/c/openstack/glance_store/+/893696
Change-Id: If99070067380a1711fb2cef4bcb090540c1ee456

manifests/backend/multistore/vsphere.pp

@@ -15,6 +15,7 @@
 #
 # == Define: glance::backend::multistore::vsphere
 #
+# DEPRECATED !!
 # Used to configure vsphere backends for glance
 #
 # === Parameters
@@ -98,6 +99,9 @@ define glance::backend::multistore::vsphere(
 
   include glance::deps
 
+  warning("The VMWare Datastore store driver support has been deprecated. \
+It will be removed in a future release.")
+
   glance_api_config {
     "${name}/vmware_insecure":           value => $vmware_insecure;
     "${name}/vmware_ca_file":            value => $vmware_ca_file;

releasenotes/notes/deprecate-vsphere-backend-ef2d2234c82bc0ce.yaml

@@ -0,0 +1,4 @@
+---
+deprecations:
+  - |
+    Support for VMWare Datastore store driver has been deprecated.