Moving Unix socket IOL's to use APR. Also fixed a small bug in ap_recv.

We should NEVER return a status of APR_EAGAIN and say -1 bytes read.  This
can cause some strange bugs.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@84120 13f79535-47bb-0310-9956-ffa450edef68