[cinder-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: I4face10976f5d5e6885cad8b4cd7e86066c32067

deliverables/train/cinder-tempest-plugin.yaml

@@ -12,3 +12,7 @@ releases:
     projects:
       - repo: openstack/cinder-tempest-plugin
         hash: 975953f794c65ab1124b7c42abdd5f9886b814f9
+  - version: train-last
+    projects:
+      - repo: openstack/cinder-tempest-plugin
+        hash: a2a23ca6d10c90d19cda68220d102409c75390e5

deliverables/xena/cinder-tempest-plugin.yaml

@@ -8,3 +8,8 @@ repository-settings:
   openstack/cinder-tempest-plugin: {}
 team: cinder
 type: tempest-plugin
+releases:
+  - version: 1.5.0
+    projects:
+      - repo: openstack/cinder-tempest-plugin
+        hash: a2a23ca6d10c90d19cda68220d102409c75390e5