Adapt loglevel of config errors during second pass

Don't use APLOG_STARTUP since at that point, the error log is already
available. This gives us timestamps if these errors happen during graceful
restart.

Use level 'emerg' as these errors are fatal.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1225197 13f79535-47bb-0310-9956-ffa450edef68