Testnet compatible network upgrade (#587)

* Create libp2p instance

* Change logger to stdlog

* test_connection initial commit

* Add gossipsub test

* Delete tests in network crate

* Add test module

* Clean tests

* Remove dependency on discovery

* Working publish between 2 nodes
TODO: Publish should be called just once

* Working 2 peer gossipsub test with additional events

* Cleanup test

* Add rpc test

* Star topology discovery WIP

* build_nodes builds and connects n nodes. Increase nodes in gossipsub test

* Add unsubscribe method and expose reference to gossipsub object for gossipsub tests

* Add gossipsub message forwarding test

* Fix gossipsub forward test

* Test improvements
* Remove discovery tests
* Simplify gossipsub forward test topology
* Add helper functions for topology building

* Clean up tests

* Update naming to new network spec

* Correct ssz encoding of protocol names

* Further additions to network upgrade

* Initial network spec update WIP

* Temp commit

* Builds one side of the streamed RPC responses

* Temporary commit

* Propagates streaming changes up into message handler

* Intermediate network update

* Partial update in upgrading to the new network spec

* Update dependencies, remove redundant deps

* Correct sync manager for block stream handling

* Re-write of RPC handler, improves efficiency and corrects bugs

* Stream termination update

* Completed refactor of rpc handler

* Remove crates

* Correct compile issues associated with test merge

* Build basic tests and testing structure for eth2-libp2p

* Enhance RPC tests and add logging

* Complete RPC testing framework and STATUS test

* Decoding bug fixes, log improvements, stream test

* Clean up RPC handler logging

* Decoder bug fix, empty block stream test

* Add BlocksByRoot RPC test

* Add Goodbye RPC test

* Syncing and stream handling bug fixes and performance improvements

* Applies discv5 bug fixes

* Adds DHT IP filtering for lighthouse - currently disabled

* Adds randomized network propagation as a CLI arg

* Add disconnect functionality

* Adds attestation handling and parent lookup

* Adds RPC error handling for the sync manager

* Allow parent's blocks to be already processed

* Update github workflow

* Adds reviewer suggestions

beacon_node/network/Cargo.toml

@@ -21,3 +21,6 @@ error-chain = "0.12.1"
 tokio = "0.1.22"
 parking_lot = "0.9.0"
 smallvec = "0.6.11"
+# TODO: Remove rand crate for mainnet
+rand = "0.7.2"
+fnv = "1.0.6"