Cosmetic changes only to align with trunk to aid trunk/7.0.x diffs

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1628532 13f79535-47bb-0310-9956-ffa450edef68
Ensure SPNEGO authentication continues to work with the JNDI Realm using delegated credentials with recent Oracle JREs.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1628534 13f79535-47bb-0310-9956-ffa450edef68
Correct a couple of NPEs in the JNDI Realm that could be triggered with when not specifying a roleBase and enabling roleSearchAsUser.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1628538 13f79535-47bb-0310-9956-ffa450edef68
Update docs as automatically setting the system property javax.security.auth.useSubjectCredsOnly was removed since it broke SPNEGO on IBM JREs.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1628543 13f79535-47bb-0310-9956-ffa450edef68