REGRESSION (r143931): set-cookie-on-redirect.html still breaking subsequent tests

Reviewed by Brady Eidson.

Work around <rdar://problem/10080130> by making the cookie persistent, session
cookies are deleted in a way that confuses some code paths in CFNetwork.

I'll unskip tests later, with another cookie reliability fix.

* http/tests/cookies/resources/set-cookie-on-redirect.php:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154410 268f45cc-cd09-0410-ab3c-d52691b4dbfc