Remove Searchlight project team

Searchlight did not have any PTL candidate for the Wallaby
cycle. As per its activities in Victoria cycle and no
maintainer, TC decided to retire Searchlight deliverables in
the Wallaby cycle. It is announced on ML too[1].

As per retirement process this commit proposes to remove
the Searchlight project from the official OpenStack projects.

If there are any maintainer who would like to continue the
development of this projects then they can continue under
opendev in x namespace or repropose it to OpenStack governance.

Depends-On: https://review.opendev.org/c/openstack/project-config/+/764535

[1] http://lists.openstack.org/pipermail/openstack-discuss/2020-November/018637.html

Change-Id: Ia8f0c05c8d6504f889b9abbc3802e55939c947be

reference/legacy.yaml

@@ -1766,6 +1766,31 @@ Release Management:
       repos:
         - openstack/release-schedule-generator
 
+searchlight:
+  retired-on: 2020-11-27
+  irc-channel: openstack-searchlight
+  service: Search service
+  mission: >
+    To provide advanced and scalable indexing and search across multi-tenant
+    cloud resources.
+  url: https://wiki.openstack.org/wiki/Searchlight
+  tags:
+    - status:maintenance-mode
+  deliverables:
+    searchlight:
+      repos:
+        - openstack/searchlight
+    searchlight-specs:
+      release-management: none
+      repos:
+        - openstack/searchlight-specs
+    python-searchlightclient:
+      repos:
+        - openstack/python-searchlightclient
+    searchlight-ui:
+      repos:
+        - openstack/searchlight-ui
+
 Security:
   ptl:
     name: Luke Hinds

reference/projects.yaml

@@ -2807,40 +2807,6 @@ sahara:
     tc_members:
       - ricolin
       - mugsie
-searchlight:
-  ptl:
-    name: APPOINTMENT NEEDED
-    irc: No nick supplied
-    email: example@example.org
-  appointed:
-    - stein
-  irc-channel: openstack-searchlight
-  service: Search service
-  mission: >
-    To provide advanced and scalable indexing and search across multi-tenant
-    cloud resources.
-  url: https://wiki.openstack.org/wiki/Searchlight
-  tags:
-    - status:maintenance-mode
-  deliverables:
-    searchlight:
-      repos:
-        - openstack/searchlight
-    searchlight-specs:
-      release-management: none
-      repos:
-        - openstack/searchlight-specs
-    python-searchlightclient:
-      repos:
-        - openstack/python-searchlightclient
-    searchlight-ui:
-      repos:
-        - openstack/searchlight-ui
-
-  liaisons:
-    tc_members:
-      - belmoreira
-      - mnaser
 senlin:
   ptl:
     name: XueFeng Liu