UpgradeTask612 doesn't drop the Bamboo queue_build_key table in PostGres

The following code should drop the queue_build_Key table in postgresql but for some odd reason the table doesn't get dropped.

                statement.execute("DROP TABLE QUEUE_BUILD_KEY");

The Bamboo 2.0 instance starts up and when user tries to delete a queue bamboo throws a constraint violation.

The work around for this is to run the "DROP TABLE QUEUE_BUILD_KEY" manually