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: Ic69203497bbe29709f0471beebd91f085e0c782e
Story: #2002586
Task: #24292

.zuul.yaml

@@ -1,3 +1,11 @@
 - project:
     templates:
       - designate-devstack-jobs
+      - openstack-python-jobs
+      - publish-openstack-sphinx-docs
+      - check-requirements
+      - openstackclient-plugin-jobs
+      - openstack-python35-jobs
+    post:
+      jobs:
+        - openstack-tox-cover

test-requirements.txt

@@ -7,6 +7,7 @@ coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD
 oslo.config>=5.1.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
+os-testr>=1.0.0  # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
 requests-mock>=1.1.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD