Revert "Remove PyMySQL and psycopg2 from test-requirements.txt"
Revert "Remove PyMySQL and psycopg2 from test-requirements.txt"

These packages needed for DB tests

This reverts commit 581ba2e0cc6bb205a70a3bab1b8bdba1d6892b73.

Change-Id: Ia4bf3cd52f0f70c32dc61079125faeb608d8889a

egafford/sahara,tellesnobrega/sahara,tellesnobrega/sahara,egafford/sahara,openstack/sahara,openstack/sahara