Add a substrate-peerset crate (#2042)

* Add a substrate-peerset crate

* Some adjustements

* More adjustements

* Use a temporary libp2p branch

* Add back-off mechanism

* Fix RPC tests

* Some adjustements

* Another libp2p bugfix

* Do a round-robin in the peerset

* Use a real dependency instead of a patch for libp2p

* Initialize reserved nodes correctly

* Better diagnostic for no address

* Don't allocate slots if in reserved only

* Ban node on dial failure

* Fix indentation

substrate/core/network-libp2p/Cargo.toml

@@ -13,7 +13,7 @@ bytes = "0.4"
 error-chain = { version = "0.12", default-features = false }
 fnv = "1.0"
 futures = "0.1"
-libp2p = { version = "0.5.0", default-features = false, features = ["secio-secp256k1", "libp2p-websocket"] }
+libp2p = { git = "https://github.com/tomaka/libp2p-rs", branch = "substrate-tmp-2019-03-20", default-features = false, features = ["secio-secp256k1", "libp2p-websocket"] }
 parking_lot = "0.7.1"
 lazy_static = "1.2"
 log = "0.4"
@@ -22,6 +22,7 @@ serde = "1.0.70"
 serde_derive = "1.0.70"
 serde_json = "1.0.24"
 smallvec = "0.6"
+substrate-peerset = { path = "../peerset" }
 tokio = "0.1"
 tokio-io = "0.1"
 tokio-timer = "0.2"