newChanneler: unsafe generation of inproc address

[cyrilleverrier]

func newChanneler(sockType int, endpoints string, subscribe []string, options []SockOption) *Channeler {
...
	c := &Channeler{
		id:          rand.Int63(),
...
	}
	c.commandAddr = fmt.Sprintf("inproc://actorcontrol%d", c.id)
	c.proxyAddr = fmt.Sprintf("inproc://proxy%d", c.id)
...
}

If very unlucky, two different instances of Channeler may have the exact same internal inproc address.
I would suggest to get a new c.id from an uuid string instead of rand.Int63() integer