[cinder-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: Ia2974b50515a5880c484f8881105c192328e31e6

deliverables/bobcat/cinder-tempest-plugin.yaml

@@ -8,3 +8,8 @@ repository-settings:
   openstack/cinder-tempest-plugin: {}
 team: cinder
 type: tempest-plugin
+releases:
+  - version: 1.9.0
+    projects:
+      - repo: openstack/cinder-tempest-plugin
+        hash: 09048aea04479436063b51028f52c25cd69bed7c

deliverables/xena/cinder-tempest-plugin.yaml

@@ -13,3 +13,7 @@ releases:
     projects:
       - repo: openstack/cinder-tempest-plugin
         hash: a2a23ca6d10c90d19cda68220d102409c75390e5
+  - version: xena-last
+    projects:
+      - repo: openstack/cinder-tempest-plugin
+        hash: 09048aea04479436063b51028f52c25cd69bed7c