[1.1.X] Fixed #12655 - diffsettings command now returns the diff inst…

…ead of printing. Thanks, jobscry.

Backport of r12463.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12480 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/management/commands/diffsettings.py

@@ -29,4 +29,4 @@ def handle_noargs(self, **options):
                 output.append("%s = %s  ###" % (key, user_settings[key]))
             elif user_settings[key] != default_settings[key]:
                 output.append("%s = %s" % (key, user_settings[key]))
-        print '\n'.join(output)
+        return '\n'.join(output)