[Tempest Plugins] Tag stein-last

Stein branch is in Extended Maintenance now[1]. All Tempest
plugins are branchless which means master version of Tempest
and its plugins is used to test the supported stable branches.

Once stable branch is moved to EM state then, Tempest and its
plugins compatible tag needs to be released so that we can
keep testing the EM stable branches with this tag once master
Tempest and its plugins are not compatible[2].

This tag will help for testing the stable/stein with single
compatible tag of Tempest and its plugins.

Tagging 'stein-last' as well as a new version also with same hash.
Documenting this new tag name here
- https://review.opendev.org/c/openstack/project-team-guide/+/769821

More detail on compatible version policy for Tempest and its
plugins is here
- https://docs.openstack.org/tempest/latest/tempest_and_plugins_compatible_version_policy.html

[1] https://releases.openstack.org/stein/index.html
[2] https://docs.openstack.org/tempest/latest/stable_branch_support_policy.html

Change-Id: I51476fc19128c5604dd5934fc19a97cec0e5c0ce

deliverables/stein/cinder-tempest-plugin.yaml

@@ -4,12 +4,16 @@ launchpad: cinder
 release-model: cycle-with-intermediary
 release-type: python-pypi
 repository-settings:
-  openstack/cinder-tempest-plugin:
-    tarball-base: cinder_tempest_plugin
+  openstack/cinder-tempest-plugin: {}
 team: cinder
 type: tempest-plugin
 releases:
   - projects:
       - hash: 3cd73f60d8726170c7567338d9812f0e399ab7e7
         repo: openstack/cinder-tempest-plugin
+        tarball-base: cinder_tempest_plugin
     version: 0.2.0
+  - version: stein-last
+    projects:
+      - repo: openstack/cinder-tempest-plugin
+        hash: 3b255b76966a9c4bb5deadbc0d3d372a5288830c

deliverables/wallaby/cinder-tempest-plugin.yaml

@@ -8,3 +8,8 @@ repository-settings:
   openstack/cinder-tempest-plugin: {}
 team: cinder
 type: tempest-plugin
+releases:
+  - version: 1.3.0
+    projects:
+      - repo: openstack/cinder-tempest-plugin
+        hash: 3b255b76966a9c4bb5deadbc0d3d372a5288830c