Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55778
Make value used for javax.security.sasl.qop with SPNEGO configurable.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1542362 13f79535-47bb-0310-9956-ffa450edef68