HTTPCORE-376: AbstractNIOConnPool#requestCancelled() should not process pending requests wnen being shut down
Contributed by Dmitry Potapov <potapov.d at gmail.com>

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpcore/branches/4.3.x@1581300 13f79535-47bb-0310-9956-ffa450edef68