[r=bjornt] Cronscript refactorings
Patches applied:

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--base-0
   tag of stuart.bishop@canonical.com/launchpad--trivial--0--patch-27

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--patch-1
   Refactor and tidy cronscripts

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--patch-2
   Review feedback updates

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--patch-3
   Review feedback updates

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--patch-4
   Merge from Rocketfuel

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--patch-5
   Cherry pick

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--patch-6
   Cherry pick

 * stuart.bishop@canonical.com/launchpad--cronscripts--0--patch-7
   Cherry pick

 * stuart.bishop@canonical.com/launchpad--trivial--0--patch-27
   Remove extra staging configs used for load balancing tests

 * stuart.bishop@canonical.com/launchpad--trivial--0--patch-29
   Add a hack^H^H^Hook to allow extra ZCML for scripts on production

 * stuart.bishop@canonical.com/launchpad--trivial--0--patch-30
   Instances should not share logs

 * stuart.bishop@canonical.com/launchpad--trivial--0--patch-31
   Mail processor shouldn't use Rosetta lock