Fixed #9158 -- Changed django-admin.py help to be printed to stdout instead of...

Fixed #9158 -- Changed django-admin.py help to be printed to stdout instead of stderr, so that it's more easily greppable. Thanks, petr.marhoun@gmail.com

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15921 bcc190cf-cafb-0310-a4f2-bffc1f526a37