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: Icd037c89819618a976bef66cd3d6f3e3889cc5f4
Story: #2002586
Task: #24341

zuul.d/layout.yaml

@@ -1,5 +1,12 @@
-
 - project:
     templates:
       - tripleo-multinode-baremetal-minimal
       - tripleo-multinode-container-minimal
+      - check-requirements
+      - openstack-python-jobs
+      - openstack-python35-jobs
+    check:
+      jobs:
+        - openstack-tox-cover:
+            voting: false
+