Added test case and support functions for CI opportunistic testing
using a PostgreSQL database, as part of our postgresql as a first
class citizen effort.
rebased again on top of test migration with data framework
clean up debug, and ensure pg will fail to connect gracefully
fix previous migration test which was inserting a key by id, which
postgresql doesn't like, as it doesn't adjust the autoincrement
counter.
added driver to connection string for mysql
Updated comment to expose how to do this on pg easily
Fixes:
bug 1084567
Change-Id: If0bfe5cf748f6d5724d17082be6d18b6f96f6ee4