Apply mythmon's patch

At least the parts that still apply, echoclient_ssl.py is using react already.

refs #7083

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/echoserv-ssl-react-7083@43350 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb