Pull lingering close out of the pool cleanup phase. This was causing too

Pull lingering close out of the pool cleanup phase.  This was causing too
many bugs.  Instead, it is called where it used to be called.  I have
abstracted some of the logic out of the lingering close so that it gets
the socket from the connection using the core's conn_config vector.  This
is in anticipation of a change to use a hook for the lingering close,
which I hope to do soon.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91968 13f79535-47bb-0310-9956-ffa450edef68