Follow on to 1057048:

In the map of active workers, don't print spaces for scoreboard
slots which aren't used due to ThreadsPerChild < ThreadLimit or 
MaxClients/ThreadsPerChild < ServerLimit; simply omit those slots
from the display.  Workers in those slots which are gracefully
exiting (from a previous generation with a different MPM config)
will be displayed, and the map will shrink as those workers exit.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1097070 13f79535-47bb-0310-9956-ffa450edef68