This begins to remove BUFF from the server. The idea is to go very slowly

This begins to remove BUFF from the server.  The idea is to go very slowly
with this.  To begin with, we store both the socket and the BUFF in the
conn_rec.  Functions are free to use which ever they want, in the end all
of the data goes to the same place.  This modifies all of the MPMs except
Windows.  All of the Unix MPMs are working, but the others need to be
tested.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86651 13f79535-47bb-0310-9956-ffa450edef68