make the output of 'core show settings' a bit nicer.

(closes issue #12020)
Reported by: seanbright
Patches:
      asterisk.c.patch uploaded by seanbright (license 71)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@103783 65c4cc65-6c06-0410-ace0-fbb531ad65f3