Add noop-jobs for networking-midonet projects

Per discussion in [1], we need to deprecate networking-midonet project due to
lack of maintainers of that project.

[1] http://lists.openstack.org/pipermail/openstack-discuss/2021-March/021400.html

Change-Id: I901fd38c275c53d80c77c674c0ff60721505701e

gerrit/projects.yaml

@@ -3738,7 +3738,7 @@
   description: RETIRED, Tempest plugin for the Neutron L2GW.
   acl-config: /home/gerrit2/acls/openstack/retired.config
 - project: openstack/networking-midonet
-  description: Midonet Neutron Plugin
+  description: DEPRECATED, Midonet Neutron Plugin
   options:
     - translate
 - project: openstack/networking-odl

zuul.d/projects.yaml

@@ -3315,18 +3315,14 @@
     name: openstack/networking-midonet
     templates:
       - official-openstack-repo-jobs
-      - periodic-jobs-with-neutron-lib-master
-      - translation-jobs-master-only
-      - publish-to-pypi
-    periodic:
+    check:
       jobs:
-        - openstack-tox-py36-with-neutron-lib-master:
-            required-projects:
-              - openstack/neutron-fwaas
-              - openstack/neutron-vpnaas
-              - openstack/neutron-dynamic-routing
-              - x/networking-l2gw
-              - x/tap-as-a-service
+        - noop:
+            branches: master
+    gate:
+      jobs:
+        - noop:
+            branches: master
 
 - project:
     name: openstack/networking-odl