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: I65217d73f55132dbd1ca48ac421cba504543d1cb
Story: #2002586
Task: #24327

.zuul.yaml

@@ -0,0 +1,24 @@
+- project:
+    check:
+      jobs:
+        - openstack-tox-bashate
+        - legacy-tempest-dsvm-full-devstack-plugin-ceph:
+            voting: false
+            irrelevant-files:
+              - ^(test-|)requirements.txt$
+              - ^setup.cfg$
+        - manila-tempest-minimal-dsvm-cephfs-native-centos-7:
+            voting: false
+        - manila-tempest-minimal-dsvm-cephfs-nfs-centos-7:
+            voting: false
+    gate:
+      jobs:
+        - openstack-tox-bashate
+    experimental:
+      jobs:
+        - legacy-tempest-dsvm-py35-full-devstack-plugin-ceph:
+            irrelevant-files:
+              - ^(test-|)requirements.txt$
+              - ^setup.cfg$
+        - manila-tempest-minimal-py35-dsvm-cephfs-native-centos-7
+        - manila-tempest-minimal-py35-dsvm-cephfs-nfs-centos-7