[1.3.X] Fixed #16528 - Documented test runner returns 1, regardless of the...

[1.3.X] Fixed #16528 - Documented test runner returns 1, regardless of the number of test failures; thanks teraom.

Backport of r16584 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@16585 bcc190cf-cafb-0310-a4f2-bffc1f526a37