Deprecating ScaleIO Volume Config

The use of resource cinder::backend::scaleio is
now deprecated in favor of the new resource
cinder::backend::dellemc_vxflexos instead.
See review https://review.opendev.org/#/c/725979/

Change-Id: I278e82984141874cb04eb9a65b9782f58eaa6e13

manifests/backend/scaleio.pp

@@ -127,6 +127,9 @@ define cinder::backend::scaleio (
   $extra_options                    = {},
 ) {
 
+  warning('The cinder::backend::sclaeio is deprecated and will be removed in W-release, \
+please use cinder::backend::dellemc_vxflexos resource instead.')
+
   cinder_config {
     "${name}/volume_backend_name":              value => $volume_backend_name;
     "${name}/backend_availability_zone":        value => $backend_availability_zone;

releasenotes/notes/scaleio-deprecate-abc8e372280c44e4.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - cinder::backend:scaleio is deprecated and will be
+    removed in the W-release, use new resource
+    cinder::backend::dellemc_vxflexos instead.