CVE-2009-3555. Provide option to disable legacy SSL renegotiation.

      Based on Costin's patch for trunk with some modifications.
Note an alternative patch is proposed but it requires some of the changes in this patch anyway.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc5.5.x/trunk@884998 13f79535-47bb-0310-9956-ffa450edef68