Remove unused code reported by FindBugs

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1432516 13f79535-47bb-0310-9956-ffa450edef68
Fix threading issue reported by FindBugs

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1432517 13f79535-47bb-0310-9956-ffa450edef68
Another false positive

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1432524 13f79535-47bb-0310-9956-ffa450edef68