Update false positives

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1574507 13f79535-47bb-0310-9956-ffa450edef68
When reporting threads that are still running while web application is being stopped, print their stack traces to the log.

Minor fixes:
Remember result of Thread.getName() as that method is not trivial.
Strip trailing whitespaces from changelog.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1574508 13f79535-47bb-0310-9956-ffa450edef68