Fixed #14426 -- Removed "mysite" import statements from examples that might...

Fixed #14426 -- Removed "mysite" import statements from examples that might teach people "bad habits" in regards to creating reusable apps.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14270 bcc190cf-cafb-0310-a4f2-bffc1f526a37