Fix relay chain node name (#1008)

Before this fix the relay chain node name was always a random generated, because we did not had
implemented all the required methods of the `CliConfiguration` trait.

parachain-template/node/src/command.rs

@@ -432,4 +432,8 @@ impl CliConfiguration<Self> for RelayChainCli {
 	) -> Result<Option<sc_telemetry::TelemetryEndpoints>> {
 		self.base.base.telemetry_endpoints(chain_spec)
 	}
+
+	fn node_name(&self) -> Result<String> {
+		self.base.base.node_name()
+	}
 }