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: I1ac468a79075a0ac66612850d3319e3386046583
Story: #2002586
Task: #24286

.zuul.yaml

@@ -1,11 +1,33 @@
 - project:
+    templates:
+      - check-requirements
+      - openstack-python-jobs
+      - openstack-python35-jobs
     check:
       jobs:
         - openstack-tox-lower-constraints:
             required-projects:
               - openstack/nova
+        - openstack-tox-pep8:
+            required-projects:
+              - openstack/nova
+        - openstack-tox-py27:
+            required-projects:
+              - openstack/nova
+        - openstack-tox-py35:
+            required-projects:
+              - openstack/nova
     gate:
       jobs:
         - openstack-tox-lower-constraints:
             required-projects:
               - openstack/nova
+        - openstack-tox-pep8:
+            required-projects:
+              - openstack/nova
+        - openstack-tox-py27:
+            required-projects:
+              - openstack/nova
+        - openstack-tox-py35:
+            required-projects:
+              - openstack/nova