Fixed the problems with kill -USR1 leaving children around too long

and causing server crash at next kill -HUP. I.e., fixed graceful restarts.
Submitted by: Ben Laurie (ben@algroup.co.uk)
Reviewed by: Roy Fielding, Paul Richards


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77031 13f79535-47bb-0310-9956-ffa450edef68