Move the shared scoreboard data initization to the balancer module.

The initialization is done like for the worker, on first request.
This is done because during config phase we don't have a scoreboard
to allocate from. Thanks to Chritian von Roques for spotting that.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105057 13f79535-47bb-0310-9956-ffa450edef68