Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56526
Improved StuckThreadDetectionValve to allow to interrupt stuck threads.
merged r1595331 from trunk

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1596047 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56461
New option to make context startup fail if a load-on-startup servlet fails
merged r1595690 from trunk

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1596052 13f79535-47bb-0310-9956-ffa450edef68