Multiple fixes to the lingering_close code in order to avoid being

interrupted by a stray timeout, to avoid lingering on a connection
that has already been aborted or never really existed, to ensure that
we stop lingering as soon as any error condition is received, and to
prevent beng stuck indefinitely if the read blocks.

Submitted by: Marc Slemko and Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77477 13f79535-47bb-0310-9956-ffa450edef68