Gate on Postrgres in trove

Trove uses a database itself, so lets make sure it works on postgres.

This fixes an asymmetric hole in the gate. If a patch breaks postgres
compatibility in trove then projects that gate on postgres will begin
failing.

Change-Id: I53e7fa2729542b88b43cd3de51e15118adaeec57
Related-Bug: 1321093
Merge "Gate on Postrgres in trove"