[designate-tempest-plugin] Tag wallaby-last

Wallaby 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 'wallaby-last' as well as a new version also with same hash.

[1] https://releases.openstack.org/wallaby/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

Change-Id: I186ed1ee6a6ae86556a4e1d8b5f2d4288ac20fb0

deliverables/antelope/designate-tempest-plugin.yaml

@@ -13,3 +13,7 @@ releases:
     projects:
       - repo: openstack/designate-tempest-plugin
         hash: e52be15f300c5cb3aae56839a55b19e5f493119b
+  - version: 0.16.0
+    projects:
+      - repo: openstack/designate-tempest-plugin
+        hash: ff6c24db8461975b9409505f0dca89909ea410c9

deliverables/wallaby/designate-tempest-plugin.yaml

@@ -17,3 +17,7 @@ releases:
     projects:
       - repo: openstack/designate-tempest-plugin
         hash: e98a05ac3520a8264ce1a31b1e9a0faef45bebc1
+  - version: wallaby-last
+    projects:
+      - repo: openstack/designate-tempest-plugin
+        hash: ff6c24db8461975b9409505f0dca89909ea410c9