Fix seg fault at start-up introduced by Ryan's change to enabl

Fix seg fault at start-up introduced by Ryan's change to enabl
modules to specify their own logging tags. mod_log_config
registers an optional function, ap_register_log_handler().
ap_register_log_handler() was being called by http_core before
the directive hash table was created. This patch creates the
directive hash table before ap_register_log_handler() is
registered as an optional function.

Submitted by:  [jean-frederic clere <jfrederic.clere@fujitsu-siemens.com>]
Reviewed by:  Jeff Trawick, Bill Stoddard

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88904 13f79535-47bb-0310-9956-ffa450edef68