This change allows running either tempest or zaqarclient as testsuite in
Zaqar's gate. Ideally, we should focus on bringing as much tests as
possible to zaqarclient. However, we can't just give up on maintaining
tempest tests update. If anything, we should work harder on bringing
these in-tree or just contribute to the project.
Related-to: I1ba10b18560f35f48a7258eaa2a57727617760bd
Depends-on: Ifcf54fa2d4a5bf49b6757b593bb70cdeda8edb2a
Related-to: Idbc2c9fbd5c63db01ce28e4a52d1a917e4360363
Depends-On: I0f1fd4374125d4b489f3804b79a672b39c714421
Change-Id: I36ac3833ad55123fba0ea71259be6d56353d53e1
95317c0c13