[watcher] Transition Ocata to End of Life

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

This is needed as stable/ocata is not actively maintained in the recent
period and thus gate is broken due to job failures. 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/ocata 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: I740b00fa8583a46d60d72bf9b8a1ea03105657e9

deliverables/ocata/python-watcherclient.yaml

@@ -24,5 +24,9 @@ releases:
       - hash: cec8ee4f153e9fa536c4158c166cf3c40e324da8
         repo: openstack/python-watcherclient
     version: ocata-em
+  - version: ocata-eol
+    projects:
+      - repo: openstack/python-watcherclient
+        hash: cb493bbf6805c531abc7b972b84258e5851bf106
 repository-settings:
   openstack/python-watcherclient: {}

deliverables/ocata/watcher-dashboard.yaml

@@ -28,6 +28,10 @@ releases:
       - hash: d9852e72158767df0cf151d11a1eab85f003dd95
         repo: openstack/watcher-dashboard
     version: ocata-em
+  - version: ocata-eol
+    projects:
+      - repo: openstack/watcher-dashboard
+        hash: f1f3db08699561257fa9ae525c274c8cd2c0b9bb
 repository-settings:
   openstack/watcher-dashboard: {}
 # Retriggering ocata-em tagging

deliverables/ocata/watcher.yaml

@@ -37,6 +37,10 @@ releases:
       - hash: 1caf89686c7f13e8164dbbd6bd8c09b9ee66f9c4
         repo: openstack/watcher
     version: ocata-em
+  - version: ocata-eol
+    projects:
+      - repo: openstack/watcher
+        hash: 8d5e816eaad53f620687a07225c0acad693c909c
 repository-settings:
   openstack/watcher: {}
 # Retriggering ocata-em tagging