Deprecate support for VZStorage driver

The driver has been marked unsupported since train release.

Depends-on: https://review.opendev.org/680701
Change-Id: I7e5d563d7ab3c042e6eed881bed00deda186134a

manifests/backend/vstorage.pp

@@ -1,5 +1,6 @@
-# == Class: cinder::backend::vstorage
+# == Define: cinder::backend::vstorage
 #
+# DEPRECATED !!
 # Configures Cinder to use VStorage volume driver.
 #
 # === Parameters
@@ -82,6 +83,9 @@ define cinder::backend::vstorage (
   include cinder::deps
   include cinder::params
 
+  warning("Support for VZStorageDriver has been deprecated because the driver \
+is now marked unsupported.")
+
   $mount_user_real = pick($mount_user, $::cinder::params::user)
 
   cinder_config {

releasenotes/notes/deprecate-vstorage-f5f1738d44104db7.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    Support for VZStorageDriver has been deprecated. The driver has
+    been marked unsupported in cinder for multiple releases.