Implemented this by adding an internal hook for work that should be performed
before that point.
Also, regarding the `DatabaseCreation.set_autocommit()` method:
* Stop using it for such tasks
* Stop providing an implementation that tries to cover all the possible
idioms a third party database backend DB-API 2 driver could need to activate
autocommit. It is now left for third party backends to implement.
This can be backwards incompatible in the case of user applications that:
* Had started using this method
* Use a third a party database backend
git-svn-id: http://code.djangoproject.com/svn/django/trunk@16520 bcc190cf-cafb-0310-a4f2-bffc1f526a37