[telemetry-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: I1d12ad572d5315616696dcf88ba86a276a2d042d

deliverables/train/telemetry-tempest-plugin.yaml

@@ -13,3 +13,7 @@ releases:
     projects:
       - repo: openstack/telemetry-tempest-plugin
         hash: d60e6e2cd466bf2912f71b25b03939e953093f6c
+  - version: train-last
+    projects:
+      - repo: openstack/telemetry-tempest-plugin
+        hash: 590f33806abd61d22a24a5adb122504536a09b84

deliverables/xena/telemetry-tempest-plugin.yaml

@@ -9,3 +9,8 @@ repository-settings:
     tarball-base: telemetry_tempest_plugin
 team: Telemetry
 type: tempest-plugin
+releases:
+  - version: 1.4.0
+    projects:
+      - repo: openstack/telemetry-tempest-plugin
+        hash: 590f33806abd61d22a24a5adb122504536a09b84