Prevent apachectl from complaining if the PIDFILE exists but

does not contain a process id, as might occur if the server is
being rapidly restarted.

Submitted by:	Wilfredo Sanchez <wsanchez@apple.com>
Reviewed by:	Roy Fielding, Jim Jagielski


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82781 13f79535-47bb-0310-9956-ffa450edef68