Fixed #17099 -- Removed an out-of-date warning and some unused code, now that...

Fixed #17099 -- Removed an out-of-date warning and some unused code, now that startapp doesn't require creating app inside project. Thanks ptone for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17030 bcc190cf-cafb-0310-a4f2-bffc1f526a37