Ensure that role tests pin pip/setuptools/wheel

Currently the role tests use whatever versions of pip,
setuptools and wheel are already installed on the host.

When a version of these tools changes it often causes
problems for our testing.

This will ensure that we use a known good set of pins
which is maintained in the general SHA bumping process.

Change-Id: I5720eb69cfbbe24136ebdfcac9c68893b3595b27
(cherry picked from commit 0ca9a2c45c)

test-vars.yml

@@ -446,7 +446,7 @@ swift_proxy_server_workers: 2
 pip_install_options: "--no-binary libvirt-python"
 
 # The URL/path of a constraints file to use when installing the additional pip packages.
-pip_install_upper_constraints: "http://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/ocata"
+pip_install_upper_constraints: "http://git.openstack.org/cgit/openstack/openstack-ansible/plain/global-requirement-pins.txt?h=stable/ocata --constraint http://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/ocata"
 
 # As role tests are executed in temporary environments, we don't need
 # to always fetch the latest get-pip.py script

tox.ini

@@ -99,6 +99,7 @@ commands =
 [testenv:ansible]
 deps =
     {[testenv]deps}
+    -rhttps://git.openstack.org/cgit/openstack/openstack-ansible/plain/global-requirement-pins.txt?h=stable/ocata
     -r{toxinidir}/test-ansible-deps.txt