Update to latest libp2p (#1386)

* Update to latest libp2p

* Fix indentations

* Add basic test

* Apply suggestions from code review

Co-Authored-By: tomaka <pierre.krieger1708@gmail.com>

* Remove Mutex from topology

* Remove unused method

* Fix concerns

substrate/core/network-libp2p/src/lib.rs

@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
-//! Substrate libp2p implementation of the ethcore network library
+//! Networking layer of Substrate.
 
 #![recursion_limit = "128"]
 
@@ -31,6 +31,8 @@ extern crate rand;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
+extern crate smallvec;
+extern crate void;
 extern crate bytes;
 extern crate unsigned_varint;
 
@@ -41,12 +43,11 @@ extern crate log;
 #[cfg(test)] #[macro_use]
 extern crate assert_matches;
 
+mod behaviour;
 mod custom_proto;
 mod error;
-mod node_handler;
 mod secret;
 mod service_task;
-mod swarm;
 mod topology;
 mod traits;
 mod transport;