updates, cleanups, and clarifications to the sample conf files.  Uses more of the preprocessor variables for simplicity. FSBUILD-2 from Mark D. Anderson.  Thanks Mark.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5034 d0543943-73ff-0310-b7d9-9358b9ac24b2