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: I4656e778a0b8c51563753a00f13a36bb77b68c0e
Story: #2002586
Task: #24341

zuul.d/layout.yaml

@@ -1,9 +1,11 @@
-
 - project:
     templates:
       - tripleo-undercloud-jobs
       - tripleo-multinode-baremetal-minimal
       - tripleo-multinode-container-minimal
+      - check-requirements
+      - release-notes-jobs
+      - openstack-python35-jobs-no-constraints
     check:
       jobs:
         - tripleo-ci-centos-7-3nodes-multinode
@@ -109,6 +111,7 @@
               - ci/pingtests/scenario007-multinode.yaml
               - ^puppet/services/.*ovn.*$
               - config/general_config/featureset028.yml
+        - openstack-tox-pep8
     gate:
       queue: tripleo
       jobs:
@@ -197,6 +200,7 @@
               - ci/pingtests/scenario007-multinode.yaml
               - ^puppet/services/.*ovn.*$
               - config/general_config/featureset028.yml
+        - openstack-tox-pep8
     experimental:
       jobs:
         - tripleo-ci-centos-7-scenario006-multinode-oooq: