Add a "console active" CLI command, which lets you find out which console device

is currently active for the Asterisk CLI, or to set it.  Also, knock multiple device
support off of the to-do list.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@99248 65c4cc65-6c06-0410-ace0-fbb531ad65f3