Fix a bug where messages were getting duplicated on AMI.

This was caused by forwarding all endpoint messages to manager which includes
channel messages that are related to the endpoint. This change causes only
the PeerStatus messages to be forwarded to manager thus eliminating the
duplicate channel messages.


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@392627 f38db490-d61c-443f-a65b-d21fe96a405b