libp2p-0.5.0 (#1971)

* Update libp2p. Add support for ed25519 node (network) keys.

  * Update networking to the changes from https://github.com/libp2p/rust-libp2p/pull/972.
  * Add support for using ed25519 keys for libp2p networking.
  * Add support for reading libp2p secret keys from (external) files.

* Adapt to changes from https://github.com/libp2p/rust-libp2p/pull/992

* More tests.

* Cosmetics

* Deduplicate tests.

* Remove quickcheck from tests that don't use extra random inputs.

* Remove quickcheck.

* Swap new/default impls for NetworkConfiguration.

* Use libp2p-0.5.0 from crates.io.

* Post-rebase update.

* Remove unnecessary wildcard pattern.

* Combine two overlapping tests.

substrate/core/network/src/lib.rs

@@ -42,9 +42,11 @@ pub use service::{Service, FetchFuture, TransactionPool, ManageNetwork, NetworkM
 pub use protocol::{ProtocolStatus, PeerInfo, Context};
 pub use sync::{Status as SyncStatus, SyncState};
 pub use network_libp2p::{
-    NodeIndex, ProtocolId, Severity, Protocol, Multiaddr,
+	identity, multiaddr,
+	NodeIndex, ProtocolId, Severity, Multiaddr,
 	NetworkState, NetworkStatePeer, NetworkStateNotConnectedPeer, NetworkStatePeerEndpoint,
-    obtain_private_key, build_multiaddr, PeerId, PublicKey
+	NodeKeyConfig, Secret, Secp256k1Secret, Ed25519Secret,
+	build_multiaddr, PeerId, PublicKey
 };
 pub use message::{generic as generic_message, RequestId, Status as StatusMessage, ConsensusEngineId};
 pub use error::Error;