moved net/swarm2 -> swarm
mocknet: printing internal mocknet state
mocknet: bugfix on opening conns + printer
mocknet: FullMesh connects to self too.

@maybebtc thoughts on this? dialing self should be
**possible**, so we should in general test that we do
consider that case, but not sure if this is good to expose
to clients. thoughts?

Btw, on why dialing self should be possible, we may create
little protocols which we may have a node connect to self,
say across its interfaces to test connectivity, etc...
think of it like:

> server localhost:1234 &
> curl localhost:1234
mocknet: internals test

Found bugs with it :)