[1.2.X] Reordered the shutdown process for tests so that all tests force a...

[1.2.X] Reordered the shutdown process for tests so that all tests force a connection close. This is required to prevent some cross-test failures. Thanks to Florian Apolloner for the report and help tracking down the problem.

Backport of r14399 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15391 bcc190cf-cafb-0310-a4f2-bffc1f526a37