Speed up the server's response to a spike in incoming workload

or restarts.

New processes aren't able to start all their threads right away
if other dying processes share the same scoreboard real estate.
So give empty process slots in the scoreboard top priority.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89928 13f79535-47bb-0310-9956-ffa450edef68