Initial commit of zuulv3 jobs

Here we are adding shade to zuulv3.o.o to aid in testing.

Add UPPER_CONSTRAINTS_FILE to tox whitelist of variables.

Change-Id: I4bc3bd751a80308df3b2114f95886bd104516dd2
Depends-On: Ib9f0a787998f34414c8072074113d29cdb8cdb59
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

.zuul.yaml

@@ -0,0 +1,5 @@
+- project:
+    name: openstack-infra/shade
+    check:
+      jobs:
+        - tox-py35-constraints

tox.ini

@@ -6,6 +6,7 @@ skipsdist = True
 [testenv]
 usedevelop = True
 basepython = {env:SHADE_TOX_PYTHON:python2}
+passenv = UPPER_CONSTRAINTS_FILE
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}