[ironic-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: If9adb2f68664c6526908186dc0c11649d27bb55e

deliverables/bobcat/ironic-tempest-plugin.yaml

@@ -7,4 +7,9 @@ release-type: python-pypi
 repository-settings:
   openstack/ironic-tempest-plugin: {}
 team: ironic
+releases:
+  - version: 2.7.0
+    projects:
+      - repo: openstack/ironic-tempest-plugin
+        hash: 3c8235ed02c10940fc3889ae04d9ba7a6a8bbb34
 type: tempest-plugin

deliverables/xena/ironic-tempest-plugin.yaml

@@ -17,3 +17,7 @@ releases:
     projects:
       - repo: openstack/ironic-tempest-plugin
         hash: 663ced6346fcbb3fe74bd750a8100f66e0c3df5e
+  - version: xena-last
+    projects:
+      - repo: openstack/ironic-tempest-plugin
+        hash: 3c8235ed02c10940fc3889ae04d9ba7a6a8bbb34