Report the network PeerId to the telemetry (#1835)

* Report the network PeerId to the telemetry

* Fix accidental paste

substrate/core/network/src/service.rs

@@ -20,7 +20,7 @@ use std::{io, thread};
 use log::{warn, debug, error, trace};
 use futures::{Async, Future, Stream, stream, sync::oneshot};
 use parking_lot::Mutex;
-use network_libp2p::{ProtocolId, PeerId, NetworkConfiguration, NodeIndex, ErrorKind, Severity};
+use network_libp2p::{ProtocolId, NetworkConfiguration, NodeIndex, ErrorKind, Severity};
 use network_libp2p::{start_service, parse_str_addr, Service as NetworkService, ServiceEvent as NetworkServiceEvent};
 use network_libp2p::{Protocol as Libp2pProtocol, RegisteredProtocol};
 use consensus::import_queue::{ImportQueue, Link};
@@ -36,6 +36,8 @@ use crate::specialization::NetworkSpecialization;
 use tokio::prelude::task::AtomicTask;
 use tokio::runtime::Runtime;
 
+pub use network_libp2p::PeerId;
+
 /// Type that represents fetch completion future.
 pub type FetchFuture = oneshot::Receiver<Vec<u8>>;
 
@@ -180,6 +182,11 @@ impl<B: BlockT + 'static, S: NetworkSpecialization<B>> Service<B, S> {
 		self.network.lock().average_upload_per_sec()
 	}
 
+	/// Returns the network identity of the node.
+	pub fn local_peer_id(&self) -> PeerId {
+		self.network.lock().peer_id().clone()
+	}
+
 	/// Called when a new block is imported by the client.
 	pub fn on_block_imported(&self, hash: B::Hash, header: B::Header) {
 		let _ = self