mod_proxy: only cleanup the socket for a connection asked to be closed but
whose address can still be reused.

This saves unnecessary socket pool destroy and creation at cleanup and reuse
time, plus the same initialization of conn->pool's associated data which can
be reused in that case.


r1703807 | ylavic | 2015-09-18 12:58:58 +0200 (Fri, 18 Sep 2015) | 5 lines

mod_proxy: don't recyle backend announced "Connection: close" connections.
Failing to do this may lead to a race condition where we send a new request
before the backend really closes the connection (or lost SSL-Alert/FIN make
us think the connection is still alive, until the retransmission).


r1703813 | ylavic | 2015-09-18 13:48:31 +0200 (Fri, 18 Sep 2015) | 1 line

mod_proxy: follow up to r1703807: CHANGES entry.


Submitted by: ylavic
Committed by: ylavic
Reviewed  by: ylavic, rjung, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1707556 13f79535-47bb-0310-9956-ffa450edef68