Added the ability to do "meetme concise" with the "meetme" CLI command.

This extends the concise capabilities of this CLI command to include
listing all conferences, instead of an addition to the other sub commands
for the "meetme" command.

(closes issue #11078)
Reported by: jthomas
Patches: 
      meetme-concise.patch uploaded by jthomas (license 293)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89073 65c4cc65-6c06-0410-ace0-fbb531ad65f3