This should prevent connection drops.

The diff is a bit bigger than expected because the protocol handshake
logic has moved out of Peer. This is necessary because the protocol
handshake will have custom framing in the final protocol.

JSON log updates

Cleanup imports

p2p/discover: fix pending replies iteration

Range expressions capture the length of the slice once before the first
iteration. A range expression cannot be used here since the loop
modifies the slice variable (including length changes).

My temporary fix was merged upstream.

code.google.com/p/go.crypto is deprecated and will cause
problems in future versions of Go.

code.google.com/p/go.net is deprecated and will cause
problems in future versions of Go.

We forgot to update this reference when moving ecies into the
go-ethereum repo.