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

Depends-On: https://review.openstack.org/#/c/594338/
Change-Id: I05469c61634ab1e5a450c9f04916db4ea5461ad6
Story: #2002586
Task: #24324

.zuul.yaml

@@ -0,0 +1,7 @@
+- project:
+    templates:
+      - openstack-python-jobs
+      - openstack-python35-jobs-nonvoting
+      - check-requirements
+      - publish-openstack-sphinx-docs
+      - release-notes-jobs