Allow callstream to broadcast to multiple servers

[lilhoser]

It could be useful to stream call data to multiple servers - as an example, one server running pizzawave UI and another running pizzacmd from linux.

Example TR configuration syntax:

"plugins": [
        {
	        "name":"callstream",
            "library":"libcallstream.so",
            "addresses":["192.168.1.122","192.168.1.245"],
            "port":9123,
            "streams":[
                {
                    "TGID":0,
                    "shortName":"whiteoakmt-hamilton"
                },
                {
                    "TGID":0,
                    "shortName":"whiteoakmt-nbradley"
                },
                {
                    "TGID":0,
                    "shortName":"whiteoakmt-cleveland"
                }
            ]
        }
    ]