Some tweaks in the network crate (#1108)

* Move Roles to network::config

* Make network::config public

* Move NetworkConfig and NonReservedMode to config

* Move Params to config

* Move node_id() to NetworkManager and fix tests

* Rename Specialization to NetworkSpecialization

substrate/core/cli/src/lib.rs

@@ -60,7 +60,7 @@ use service::{
 	ServiceFactory, FactoryFullConfiguration, RuntimeGenesis,
 	FactoryGenesis, PruningMode, ChainSpec,
 };
-use network::{NonReservedPeerMode, Protocol};
+use network::{Protocol, config::NonReservedPeerMode};
 use primitives::H256;
 
 use std::io::{Write, Read, stdin, stdout};