Initial Interop Updates (#492)

* Add interop chain spec and rename chain_id

* Add ability to connect to raw libp2p nodes

* Adds Identify protocol, clean up RPC protocol name handling

* Update to latest libp2p, gossipsub improvements

* Updates to latest interop branch.

- Shifts decoding of objects into message handler.
- Updates to latest interop gossipsub.
- Adds interop spec constant.

* Configuration updates allow for verbosity CLI flag and spec constants

* Update submodules to master

* Correct minimal chainspec modifications

* Duplication of validator polls are no longer fatal

* Apply PR suggestions

beacon_node/eth2-libp2p/src/rpc/mod.rs

@@ -6,9 +6,9 @@
 
 use futures::prelude::*;
 use handler::RPCHandler;
-use libp2p::core::protocols_handler::ProtocolsHandler;
-use libp2p::core::swarm::{
-    ConnectedPoint, NetworkBehaviour, NetworkBehaviourAction, PollParameters,
+use libp2p::core::ConnectedPoint;
+use libp2p::swarm::{
+    protocols_handler::ProtocolsHandler, NetworkBehaviour, NetworkBehaviourAction, PollParameters,
 };
 use libp2p::{Multiaddr, PeerId};
 pub use methods::{ErrorMessage, HelloMessage, RPCErrorResponse, RPCResponse, RequestId};
@@ -16,7 +16,6 @@ pub use protocol::{RPCError, RPCProtocol, RPCRequest};
 use slog::o;
 use std::marker::PhantomData;
 use tokio::io::{AsyncRead, AsyncWrite};
-use types::EthSpec;
 
 pub(crate) mod codec;
 mod handler;
@@ -50,16 +49,16 @@ impl RPCEvent {
 
 /// Implements the libp2p `NetworkBehaviour` trait and therefore manages network-level
 /// logic.
-pub struct RPC<TSubstream, E: EthSpec> {
+pub struct RPC<TSubstream> {
     /// Queue of events to processed.
     events: Vec<NetworkBehaviourAction<RPCEvent, RPCMessage>>,
     /// Pins the generic substream.
-    marker: PhantomData<(TSubstream, E)>,
+    marker: PhantomData<(TSubstream)>,
     /// Slog logger for RPC behaviour.
     _log: slog::Logger,
 }
 
-impl<TSubstream, E: EthSpec> RPC<TSubstream, E> {
+impl<TSubstream> RPC<TSubstream> {
     pub fn new(log: &slog::Logger) -> Self {
         let log = log.new(o!("Service" => "Libp2p-RPC"));
         RPC {
@@ -80,12 +79,11 @@ impl<TSubstream, E: EthSpec> RPC<TSubstream, E> {
     }
 }
 
-impl<TSubstream, E> NetworkBehaviour for RPC<TSubstream, E>
+impl<TSubstream> NetworkBehaviour for RPC<TSubstream>
 where
     TSubstream: AsyncRead + AsyncWrite,
-    E: EthSpec,
 {
-    type ProtocolsHandler = RPCHandler<TSubstream, E>;
+    type ProtocolsHandler = RPCHandler<TSubstream>;
     type OutEvent = RPCMessage;
 
     fn new_handler(&mut self) -> Self::ProtocolsHandler {