Release keystonemiddleware for Xena-1 milestone

This is a library release for oskeystonemiddleware for the Xena-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.

$ git log --oneline --no-merges 9.2.0..90df936
90df936 Imported Translations from Zanata
788d3c4 Switch to eventlet-safe oslo.cache's MemcacheClientPool
0a2309d Updating lower-constraints job as non voting

Signed-off-by: Hervé Beraud <hberaud@redhat.com>
Change-Id: Id44fd8e7c6fb6de734ad672d4277586f645d9de1

deliverables/xena/keystonemiddleware.yaml

@@ -6,3 +6,8 @@ team: keystone
 type: library
 repository-settings:
   openstack/keystonemiddleware: {}
+releases:
+  - version: 9.3.0
+    projects:
+      - repo: openstack/keystonemiddleware
+        hash: 90df936708aee36d77cead548d04cb7db2327f47