Rearranged main child loop to remove duplication of code in

select/accept and keep-alive requests, fixed several bugs regarding
checking scoreboard_image for exit indication and failure to
account for all success conditions and trap all error conditions,
prevented multiple flushes before closing the socket; close the entire
socket buffer instead of just one descriptor, prevent logging of
EPROTO and ECONNABORTED on platforms where supported, and generally
improved readability.

Reviewed by: Randy Terbush, Marc Slemko, Jim Jagielski, Chuck Murcko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77618 13f79535-47bb-0310-9956-ffa450edef68