[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: I4842704dcfce022848ca7903eb5c5b9624ef1470

deliverables/stein/zaqar-tempest-plugin.yaml

@@ -13,3 +13,7 @@ releases:
       - hash: 8662c910382cab39ca2c4e933637f3c9185d2b0f
         repo: openstack/zaqar-tempest-plugin
     version: 0.2.0
+  - version: stein-last
+    projects:
+      - repo: openstack/zaqar-tempest-plugin
+        hash: 9146cc9dbfcb7c6c207cf1660288ec03e172ff4e

deliverables/wallaby/zaqar-tempest-plugin.yaml

@@ -9,3 +9,8 @@ repository-settings:
     tarball-base: zaqar_tempest_plugin
 team: zaqar
 type: tempest-plugin
+releases:
+  - version: 1.2.0
+    projects:
+      - repo: openstack/zaqar-tempest-plugin
+        hash: 9146cc9dbfcb7c6c207cf1660288ec03e172ff4e