There were some inconsistencies with pip install instructions
thoughout Kolla. We fix those here.
Additionally, we fix the virtualenv to properly use the site-packages
on the host if a library is not available in the venv.
Change-Id: Ib84d48e8826bb96060338b3fa0782620c98794a8
Related-Bug: #1524684
Closes-Bug: #1529434
Use virtualenv for installation of OpenStack projects and
dependencies to avoid conflicts with Python libraries installed
by non-OpenStack binary packages.
Change-Id: I21ecd673b2e93335b1d3dd4e279e940c9d694c3c
Implements: blueprint virtualenv
Note, this image is slightly different to most others in Kolla in that
it's not a service designed to be deployed via Ansible. It's more a
'tool' type image that is spun up when needed.
Partially-Implements: blueprint tempest-gate
Change-Id: I1877c03d0804e57d274044aecb1055f847025bec
