The changes from https://review.openstack.org/#/c/23364/ simplified
the usage of database_connection_url_mysql and
database_connection_url_postgresql without making the proper changes
to database_connection_url.
Fixes: bug #1167668
Signed-off-by: Tal Kain <tal.kain@ravellosystems.com>
Change-Id: I5115d123ad794f2eb2e144b76932031af5248f26