Append the .PID to the ScriptSock filename. This change ensures that multiple
running instances of httpd will not clobber each others script sockets. 

Because a different socket will be created for each instance, this change also
unlinks the script-socket on exit, to prevent pollution. 

unlink() happens from within the parent process, since the change in userid's
means the cgid process likely won't have the correct permissions.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@240044 13f79535-47bb-0310-9956-ffa450edef68