*) simplify config file list construction (especially the second sed

   expression).
*) comment extensively.
*) process into lines which are always guaranteed to sort properly -- don't
   rely on sort switches or whether "" sorts (numerically) less than "1".


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87557 13f79535-47bb-0310-9956-ffa450edef68