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: If1920766a7ad0c079cd8df0d03baa2d478768870
Story: #2002586
Task: #24320

.zuul.yaml

@@ -20,6 +20,12 @@
       zuul_work_dir: src/git.openstack.org/openstack/python-neutronclient
 
 - project:
+    templates:
+      - openstack-python-jobs
+      - openstack-python35-jobs
+      - lib-forward-testing
+      - publish-openstack-sphinx-docs
+      - check-requirements
     check:
       jobs:
         - cliff-tox-py27-neutronclient-tip