[1.2.X] Corrected the way databases were compared. This allows running the...

[1.2.X] Corrected the way databases were compared.  This allows running the test suite with two in memory SQLite databases. Backport of [14619].

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14620 bcc190cf-cafb-0310-a4f2-bffc1f526a37