Adds presence state value to output of core show
hints.  Also reformats the output slightly so it
doesn't use as much space as it would otherwise.

Was:
                   1000@demo                : SIP/1000              State:Unavailable     Watchers  0

Now: 
1000@demo           : SIP/1000              State:Unavailable     Presence:Idle            Watchers  0

AFS-53 #close
Review: https://reviewboard.asterisk.org/r/3604/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@415698 65c4cc65-6c06-0410-ace0-fbb531ad65f3