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Let's save log.Error for things the user can take action on.
Moved all our diagnostics to log.Debug. We can ideally reduce them
even further.

TODOs:
- need to consolidate all the versioning stuff into one package
- need to do the version check as a handshake, before further
  communication happens. we used to do this.

so that we dont get stuck dialing bad addrs first always.

This will mitigate the fd explosion, but slow down dials majorly
as any peer with more addresses than the rate limit will have
to wait a whole dial timeout (~15s)

This addr manager should seriously help with the addrsplosion
problem.

this commit moves management of the nat to its own object.
perhaps this can be general enough to work with any host
(not just BasicHost), but for now keeping here.

the nat manager:
- discovers and sets up the nat asynchronously.
- adds any port mappings necessary if/after nat has been found.
- listens to the network Listen() changes, adding/closing mappings

After this commit, client can close individual mappings (without
closing the whole NAT)

Network now signals when it successfully listens on some address
or when an address shuts down. This will be used to establish and
close nat port mappings. It could also be used to notify peers
of address changes.

p2p/net: network interface Listen func

network interface now allows setting Listeners after the fact.
This is useful to create the network and start listening as
separate steps. And to keep the network up to date on new
addresses the node might have to listen to.

network interface now allows setting Listeners after the fact.
This is useful to create the network and start listening as
separate steps. And to keep the network up to date on new
addresses the node might have to listen to.

dialing 4000 connections somehow keeps choking both travis and
jenkins. dialing this down to 500

- attempts set to 1 now.
- timeouts must account for that.

p2p/net: dial log -> events

+ fixed race

This commit turns all dial logs into log.Events.

Everything's great except for one problem:
The LoggableMap I'm using does not print out things
correctly. I gave it peer.IDs, and Multiaddrs
and both got logged as nothing `{}` (didn't even call
their String() methods!) So, for now, this function
encodes it when called... This is wrong and should be
fixed before being merged in. Otherwise we  will be
constantly encoding peer.IDs and Multiaddrs without
needing to.

@briantigerchow how do you suggest doing this?
I don't know my way around your Loggable.

should be returning false.