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

This patch also adds limiting dependencies using the upper-constraints
file in tox.ini, as this is needed to unblock the gate.

Change-Id: Ib2ef3b3d0d0733842abad97898114c3dbdab3b7a
Co-Authored-By: Zane Bitter <zbitter@redhat.com>
Story: #2002586
Task: #24298

.zuul.yaml

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

tox.ini

@@ -6,6 +6,7 @@ skipsdist = True
 [testenv]
 whitelist_externals = bash
 setenv = VIRTUAL_ENV={envdir}
+install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/rocky} {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = bash -c 'if [ ! -d ./.testrepository ] ; then testr init ; fi'