Add a --no-private-ipv4 CLI option (#4042)

* Add a --no-private-ipv4 CLI option

* Fix tests

* Fix tests

substrate/core/cli/src/lib.rs

@@ -343,7 +343,7 @@ impl<'a> ParseAndPrepareBuildSpec<'a> {
 			];
 			spec.add_boot_node(addr)
 		}
-		
+
 		let json = service::chain_ops::build_spec(spec, raw_output)?;
 
 		print!("{}", json);
@@ -625,6 +625,7 @@ fn fill_network_configuration(
 
 	config.transport = TransportConfig::Normal {
 		enable_mdns: !is_dev && !cli.no_mdns,
+		allow_private_ipv4: !cli.no_private_ipv4,
 		wasm_external_transport: None,
 	};