Other SoundSync instances can't find soundsync-docker over the network

[dustin-richards-was-here]

I'm guessing this is due to avahi (or whatever network discovery SoundSync uses) not having the ports it needs exposed. soundsync-docker can see out, but others can't see in to discover it. Assuming avahi is used, a simple -p 5353:5353 isn't a great idea since it'll conflict with the avahi on the host.

The solution I see here is to set up a virtual network adapter with its own IP and MAC addresses via macvlan, this way the container's interface can grab its own IP and run avahi/whatever independently of the host.