SSL renegotiation DOS fix merged from parent project



git-svn-id: http://coturn.googlecode.com/svn/trunk@290 a3c88463-c8e2-e606-d8d5-275b8e57aef6
changelog updated



git-svn-id: http://coturn.googlecode.com/svn/trunk@291 a3c88463-c8e2-e606-d8d5-275b8e57aef6