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- distinguish log.Error and log.Errorf functions
- Initialize structs with field names
- A bit of unreachable code (defers)

transition our use of the net package to multiaddr/net

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

client expects a multiaddr. server was writing a bsaddr

There are (so far) two sorts of addresses that peers care about:

- peer network addresses, local to listen, saved to bootstrap.
  `config.Identity.Address`

- peer RPC network address, local RPC tcp endpoint
  `config.RPCAddress`

@whyrusleeping @perfmode