[designate-tempest-plugin] Tag train-last

Train 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 'train-last'[4] as well as a new version also with same hash.

[1] https://releases.openstack.org/train/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
[4] https://docs.openstack.org/project-team-guide/stable-branches.html#extended-maintenance

Change-Id: Id4e72231b72abd109a04c48af8a3cd9d4b20c446

deliverables/train/designate-tempest-plugin.yaml

@@ -12,3 +12,7 @@ releases:
     projects:
       - repo: openstack/designate-tempest-plugin
         hash: 1096ab98898796810d46113389c372eb4367fe39
+  - version: train-last
+    projects:
+      - repo: openstack/designate-tempest-plugin
+        hash: da27a70ae2b39695ef6f03bbefb55afeacf1cdf3

deliverables/xena/designate-tempest-plugin.yaml

@@ -8,3 +8,8 @@ repository-settings:
   openstack/designate-tempest-plugin: {}
 team: designate
 type: tempest-plugin
+releases:
+  - version: 0.12.0
+    projects:
+      - repo: openstack/designate-tempest-plugin
+        hash: da27a70ae2b39695ef6f03bbefb55afeacf1cdf3