Release mistral-extra for wallaby-1 milestone

This is a library release for mistral-extra for the wallaby-1
milestone. This repo includes commits that have not been releases for
this cycle yet.

If the team is ready to process with this release, please leave a +1
to indicate we should go ahead with the release.

If the team needs more time for things about to merge, or if there is
some other reason a release should not be done at this time, please
leave a -1 with a comment indicating the status. Then update the patch
with the new commit hash to use once the team is ready to do the
release.

We release a major version to reflect the changes landed by the drop of
qinling which aren't backward compatible and will have an effect during
upgrade.

dfc6c56490

Change-Id: I1b672aaf00bd116700d55772ecdbf3668778c6d1

deliverables/wallaby/mistral-extra.yaml

@@ -6,3 +6,8 @@ team: mistral
 type: library
 repository-settings:
   openstack/mistral-extra: {}
+releases:
+  - version: 11.0.0
+    projects:
+      - repo: openstack/mistral-extra
+        hash: dfc6c56490eb358018f79822ae9847e2be89d8b3