HTTPCORE-334: https request to a non-responsive but alive port results in a busy loop in one of I/O dispatch threads
Contributed by Scott Stanton <snstanton at gmail.com>

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/branches/4.2.x@1448439 13f79535-47bb-0310-9956-ffa450edef68