Add a new manager event for our buddies status.

The new JabberStatus event gives a concise view of the status change to the AMI
clients. Thanks fiddur!

(closes issue #16760)
Reported by: fiddur
Patches:
      244498.2.diff uploaded by fiddur (license 678)
Tested by: fiddur, phsultan


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@247500 65c4cc65-6c06-0410-ace0-fbb531ad65f3