Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56391
Re-write renegotiation test to test that renegotiation works rather than to test that an exception is not triggered it it is attempted.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1589299 13f79535-47bb-0310-9956-ffa450edef68
Windows OK. Seeing failures on Linux - add debug code.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1589300 13f79535-47bb-0310-9956-ffa450edef68