Backport change that added ContainerThreadMarker (needed for a backport to follow)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1602508 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56518
Do not attempt an NIO write if a thread has been interrupted as it can lead to a connection limit leak

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1602510 13f79535-47bb-0310-9956-ffa450edef68