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: Iace947037729076161d5df4cb606a6a8effda59d
Story: #2002586
Task: #24314

.zuul.yaml

@@ -0,0 +1,33 @@
+- project:
+    templates:
+      - check-requirements
+      - periodic-stable-jobs-neutron
+      - openstack-python-jobs-neutron
+      - openstack-python35-jobs-neutron
+      - release-notes-jobs
+      - publish-openstack-sphinx-docs
+    check:
+      jobs:
+        - legacy-neutron-fwaas-v2-dsvm-tempest
+        - legacy-neutron-fwaas-v1-dsvm-tempest
+        - legacy-neutron-fwaas-dsvm-functional
+        - legacy-grenade-dsvm-neutron-fwaas-multinode:
+            voting: false
+            irrelevant-files:
+              - ^(test-|)requirements.txt$
+              - ^setup.cfg$
+        - legacy-neutron-fwaas-v1-dsvm-tempest-multinode:
+            voting: false
+        - legacy-neutron-fwaas-v2-dsvm-tempest-multinode:
+            voting: false
+    gate:
+      jobs:
+        - legacy-neutron-fwaas-v2-dsvm-tempest
+        - legacy-neutron-fwaas-v1-dsvm-tempest
+        - legacy-neutron-fwaas-dsvm-functional
+    experimental:
+      jobs:
+        - legacy-neutron-fwaas-dsvm-fullstack
+    post:
+      jobs:
+        - openstack-tox-cover