Deprecate support for Quobyte driver

... because it is now marked unsupported.

Depends-on: https://review.opendev.org/922888
Change-Id: I4e6e8efe107dc3862d4dd8aa5ee86b2c9d4ed8bc

manifests/backend/quobyte.pp

@@ -1,6 +1,6 @@
+# == Define: cinder::backend::quobyte
 #
-# == Class: cinder::backend::quobyte
-#
+# DEPRECATED !!
 # Configures Cinder to use Quobyte USP as a volume driver
 #
 # === Parameters
@@ -80,6 +80,9 @@ define cinder::backend::quobyte (
 
   include cinder::deps
 
+  warning("Support for Quobyte volume driver has been deprecated because \
+the driver is now marked unsupported.")
+
   cinder_config {
     "${name}/volume_backend_name":            value => $volume_backend_name;
     "${name}/backend_availability_zone":      value => $backend_availability_zone;

releasenotes/notes/deprecate-quobyte-346d56455c680d64.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    Support for the Quobyte volume driver has been deprecated, because
+    the driver is now marked unsupported.