Add QueueSummary manager action.

Gives "at a glance" information about a single queue, or all queues.

Issue #8035, patch by rgollent, slightly modified (formatting) by me.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@43721 65c4cc65-6c06-0410-ace0-fbb531ad65f3