[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: I1989fdb9bb98335f7fcf180b8d2d403d5108886a

deliverables/stein/sahara-tests.yaml

@@ -14,5 +14,9 @@ releases:
     projects:
       - repo: openstack/sahara-tests
         hash: 994b21aacd0d4119afbbc46b2ed0b525cf5ed64c
+  - version: stein-last
+    projects:
+      - repo: openstack/sahara-tests
+        hash: edcd88782ba5221cf804a3c4b5a3c8bb5ef44b67
 repository-settings:
   openstack/sahara-tests: {}

deliverables/wallaby/sahara-tests.yaml

@@ -7,3 +7,8 @@ stable-branch-type: none
 release-type: python-pypi
 repository-settings:
   openstack/sahara-tests: {}
+releases:
+  - version: 0.12.0
+    projects:
+      - repo: openstack/sahara-tests
+        hash: edcd88782ba5221cf804a3c4b5a3c8bb5ef44b67