[1.2.X] Fixed #14159 -- Corrected more potential uses of relative paths in...

[1.2.X] Fixed #14159 -- Corrected more potential uses of relative paths in tests. Thanks to Alex Gaynor for the patch.

Backport of r13636 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@13637 bcc190cf-cafb-0310-a4f2-bffc1f526a37