[watcher] Transition Queens to End of Life

This transition the Queens branch to End of Life. The last patch of the
branch will be tagged with queens-eol tag. The stable/queens branch
cannot be used anymore and will be deleted if this patch merges.

This is needed as stable/queens is not actively maintained in the recent
period and thus gates are mostly broken due to job failures. Besides,
by removing these branches, infra resources will be freed up, too.

Please try to identify any zuul job, that is defined outside of the
repositories in this patch (for example in openstack-zuul-jobs, etc.)
and won't be used anymore if stable/queens is deleted, and propose a job
removal patch for them.

Please +1 if the team is ready for us to proceed with this transition,
or -1 if there are still some activity on the branch and the team wants
to continue to maintain it.

Change-Id: Ieb61e4fb39e398a04c5063d3c34adb9bcae0fa27

deliverables/queens/python-watcherclient.yaml

@@ -21,6 +21,10 @@ releases:
     projects:
       - repo: openstack/python-watcherclient
         hash: a1b6eed54cb92713e5847a6b033a4e33eb1fa860
+  - version: queens-eol
+    projects:
+      - repo: openstack/python-watcherclient
+        hash: 1a9bbf244b8386f60ac259b339c3b8508a5dbe36
 branches:
   - name: stable/queens
     location: 1.6.0

deliverables/queens/watcher-dashboard.yaml

@@ -28,6 +28,10 @@ releases:
     projects:
       - repo: openstack/watcher-dashboard
         hash: 191d2dbd3ea1591146106385271ed9c86f7e7c14
+  - version: queens-eol
+    projects:
+      - repo: openstack/watcher-dashboard
+        hash: 4be5d687c72e603947165d989190e933fee9d240
 repository-settings:
   openstack/watcher-dashboard: {}
 release-notes: https://docs.openstack.org/releasenotes/watcher-dashboard/queens.html

deliverables/queens/watcher.yaml

@@ -37,6 +37,10 @@ releases:
       - repo: openstack/watcher
         hash: 5307f5a80ea81c69a1bc37aead007b441a4af450
         tarball-base: python-watcher
+  - version: queens-eol
+    projects:
+      - repo: openstack/watcher
+        hash: 5307f5a80ea81c69a1bc37aead007b441a4af450
 repository-settings:
   openstack/watcher: {}
 release-notes: https://docs.openstack.org/releasenotes/watcher/queens.html