resip/stack: extract cookies even when no connection validator present

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-gsoc-2013@10548 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/stack: avoid double copy when extracting cookies

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-gsoc-2013@10549 ddefafc4-47db-0310-ae44-fa13212b10f2