Ensure that the Poller actions socket close requests ASAP

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1528248 13f79535-47bb-0310-9956-ffa450edef68
Async timeouts are checked roughly once a second. Check connection and keep-alive timeouts using the same period (rather than roughly every 5s)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1528258 13f79535-47bb-0310-9956-ffa450edef68