Ensure that role tests pin pip/setuptools/wheel
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: Icdeb79816c9917a29b0202df5aaf6611d7cd6113

openstack/openstack-ansible-openstack_hosts,openstack/openstack-ansible-openstack_hosts