no GOAWAYs on connection failures, sending last received stream id back in...

no GOAWAYs on connection failures, sending last received stream id back in GOAWAY, no more flush attempts when session has already been aborted

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1704262 13f79535-47bb-0310-9956-ffa450edef68