Updated openstack/openstack
Project: openstack/oslo.db  49a4edfb82f031da888ae8d5e98051efe9ad3c10

Add psycopg2 to test-requirements.txt

We have a few opportunistic test cases which are skipped in the gate
now because psycopg2 is missing.

Change-Id: Ia5e96ed4a6af7a311d8dc89b00a1fb4cc02f56ac