Review and fix database security update code
Patches applied:

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-223
   Merge from Rocketfuel

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-224
   Permissions on BountySubscription

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-225
   Remove noise

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-226
   Add command line to security.py for debug work

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-227
   Oops... shouldn't have committed change to security.cfg

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-228
   Ensure group membership is reset between runs

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-229
   Handle 'database does not exist' error caused by interrupting a previous test run at the wrong time

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-230
   Dev environment should connect as the correct PostgreSQL user

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-231
   Launchpad needs DELETE on EmailAddress

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-232
   Don't drop groups since they are global to the cluster - just remove all the users we care about instead

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-233
   'read' and 'admin' groups now automatically maintained

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-234
   Raise an exception if we have no security settings for a table or view

 * stuart.bishop@canonical.com/launchpad--devel--1--patch-235
   Pull dbhost/dbuser code -- need to support PQM