mod_status: Cumulate CPU time of exited child

processes in the "cu" and "cs" values.
Add CPU time of the parent process to the
"c" and "s" values.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1837595 13f79535-47bb-0310-9956-ffa450edef68