Use upper-constraints.txt for tempest installation in venv
Use upper-constraints.txt for tempest installation in venv

Currently, tempest plugins are installed via rpms and
are used(as --system-site-packages is used during virtualenv creation)
in tempest virtualenv.
Tempest installation is not currently constrained, this patch
makes it constrainted to upper-constraints.txt from [0] to avoid
dependency errors.

[0] https://github.com/openstack/requirements

Change-Id: I85510dda99e600226f78f8cbc1361e099b68a7c9

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration