[keystone-tempest-plugin] Tag xena-last

Xena branch is in Extended Maintenance now[1]. Tempest and
tempest plugins are branchless which means master version of
Tempest and its plugins is used to test the supported stable
branches.

Once any stable branch is moved to EM state then, Tempest and
its plugins compatible tag[2] needs to be released so that we can
keep testing the EM stable branches with that tag once master
Tempest and its plugins are not compatible[3].

Tagging 'xena-last' as well as a new version also with same hash.

[1] https://releases.openstack.org/wallaby/index.html
[2] https://docs.openstack.org/tempest/latest/stable_branch_support_policy.html
[3] https://docs.openstack.org/tempest/latest/tempest_and_plugins_compatible_version_policy.html

Change-Id: Icef4f9e5422c34b3c52958a2ea9fddcf022aa244

deliverables/bobcat/keystone-tempest-plugin.yaml

@@ -9,3 +9,8 @@ repository-settings:
     tarball-base: keystone_tempest_plugin
 team: keystone
 type: tempest-plugin
+releases:
+  - version: 0.13.0
+    projects:
+      - repo: openstack/keystone-tempest-plugin
+        hash: dbe56f0a07febd9e8babf54b88c63084b59f0b39

deliverables/xena/keystone-tempest-plugin.yaml

@@ -14,3 +14,7 @@ releases:
     projects:
       - repo: openstack/keystone-tempest-plugin
         hash: faa9b1389186a9a81f91f67ac78df9c0b0343b3c
+  - version: xena-last
+    projects:
+      - repo: openstack/keystone-tempest-plugin
+        hash: dbe56f0a07febd9e8babf54b88c63084b59f0b39