nova: release ocata 15.0.3

This patch release contains fixes for a few regression bugs
introduced in Ocata.

Change-Id: I181eb8c3d49043b84fc0acea1fc3f2ba7d3e6a1f

deliverables/ocata/nova.yaml

@@ -64,3 +64,11 @@ releases:
     highlights: >
       - Fix for CVE-2017-7214.
       - Fix for retry on build error regression in 15.0.0 (bug 1671648).
+  - version: 15.0.3
+    projects:
+      - repo: openstack/nova
+        hash: 6d4f9f4f6cfd3e256c68addfed0c3a033b3bf957
+    highlights: >
+      - Contains fixes for regression bugs introduced in Ocata. Specifically
+        https://bugs.launchpad.net/nova/+bug/1678326 and
+        https://bugs.launchpad.net/nova/+bug/1675570.