import zuul job settings from project-config

This is a mechanically generated patch to complete step 1 of moving
the zuul job settings out of project-config and into each project
repository.

Because there will be a separate patch on each branch, the branch
specifiers for branch-specific jobs have been removed.

Because this patch is generated by a script, there may be some
cosmetic changes to the layout of the YAML file(s) as the contents are
normalized.

See the python3-first goal document for details:
https://governance.openstack.org/tc/goals/stein/python3-first.html

Change-Id: I91a2641cf49c664a2438200e6ee669bea50b8708
Story: #2002586
Task: #24313

.zuul.yaml

@@ -1,14 +1,32 @@
 - project:
+    templates:
+      - check-requirements
+      - release-notes-jobs
+      - openstack-python-jobs-horizon
+      - openstack-python35-jobs-horizon
+      - nodejs4-jobs
     check:
       jobs:
         - murano-dashboard-sanity-check
         - openstack-tox-lower-constraints
         - horizon-openstack-tox-python3-django111
+        - openstack-tox-cover:
+            voting: false
+            required-projects:
+              - openstack/horizon
     gate:
       jobs:
         - openstack-tox-lower-constraints
         - horizon-openstack-tox-python3-django111
 
+    post:
+      jobs:
+        - openstack-tox-cover:
+            required-projects:
+              - openstack/horizon
+    experimental:
+      jobs:
+        - legacy-dashboard-dsvm-selenium-package
 - job:
     name: murano-dashboard-sanity-check
     parent: legacy-dsvm-base