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transition our use of the net package to multiaddr/net

new Service interface

and other logging switches. I kept the u.PErr and u.POut in cli
commands, as those do need to write raw output directly.

failing due to nil pointer dereference

Allows the service to be used through an interface.

NB: If the handler is exposed directly, clients of the service cannot swap out their concrete references and replace them with interfaces

@perfmode sender is exactly what we need to pass in to dht/bitswap.

We were issuing handling goroutines in both NewService and Start

@perfmode this means we can create a Service first, give it to
the network and protocol (removing interdep).

fix(net:msg) use vendored imports