Fixed #7514 -- Added code to clear the site cache on sync. This shouldn't have...

Fixed #7514 -- Added code to clear the site cache on sync. This shouldn't have any effect on regular usage, but it does correct an error in the test suite. Thanks to Marc Fargas for the fix.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7723 bcc190cf-cafb-0310-a4f2-bffc1f526a37