libp2p-next (#5278)

* Adapt to rust-libp2p#1440.

* Further adapt to libp2p/master.

* Update to libp2p-0.17

* Finishing touches.

* Remove stray TODO.

* Incorporate review feedback.

* Remove unused import.

substrate/client/network/Cargo.toml

@@ -26,7 +26,6 @@ futures = "0.3.4"
 futures_codec = "0.3.3"
 futures-timer = "3.0.1"
 wasm-timer = "0.2"
-libp2p = { version = "0.16.2", default-features = false, features = ["libp2p-websocket"] }
 linked-hash-map = "0.5.2"
 linked_hash_set = "0.1.3"
 log = "0.4.8"
@@ -59,10 +58,16 @@ unsigned-varint = { version = "0.3.1", features = ["futures", "futures-codec"] }
 void = "1.0.2"
 zeroize = "1.0.0"
 
+[dependencies.libp2p]
+version = "0.17.0"
+default-features = false
+features = ["websocket", "kad", "mdns", "ping", "identify", "mplex", "yamux", "noise"]
+
 [dev-dependencies]
 async-std = "1.5"
 assert_matches = "1.3"
 env_logger = "0.7.0"
+libp2p = { version = "0.17.0", default-features = false, features = ["secio"] }
 quickcheck = "0.9.0"
 rand = "0.7.2"
 sp-keyring = { version = "2.0.0-alpha.5", path = "../../primitives/keyring" }