Release manila 13.0.3 off of stable/xena

Producing this release to facilitate a final
release from stable/victoria which contains
bugfixes that this release stream also needs

% git log --oneline --no-merges 13.0.2..b6c2bb36

b6c2bb362 Mock tenacity in gluster driver unit tests
eb813e080 [NetApp] Fix default thin_provisioned volumes on AFF
4cf55197c [doc] Fix config and install guide for the generic driver

Change-Id: Ic80ae9060a73cf5658dcb440e09495b6341afa9c

deliverables/xena/manila.yaml

@@ -43,6 +43,10 @@ releases:
     projects:
       - repo: openstack/manila
         hash: 8ed664d628668171f16eed2e550e2d4200309622
+  - version: 13.0.3
+    projects:
+      - repo: openstack/manila
+        hash: b6c2bb362f270539f4a618d2799a7812479c404b
 branches:
   - name: stable/xena
     location: 13.0.0.0rc1