Add code to detect when a child process did not exit properly after

a HUP and give it a prod.  We do everything we can to make it die,
since if it doesn't chances are the server won't be able to bind
to the port on restart.  For some reason, some children were not
exiting and holding the whole show until they finish processing
their MaxRequestsPerChild and exit.

Reviewed by:	Randy Terbush, Roy Fielding, Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77645 13f79535-47bb-0310-9956-ffa450edef68