Generalize the Consensus Infrastructure (#883)

* Split out Consensus
* Supply ImportQueue through network-service
  - simplify ImportQueue.import_blocks
  - remove Deadlock on import_block
  - Adding Verifier-Trait
  - Implement import_queue provisioning in service; allow cli to import
* Allow to actually customize import queue
* Consensus Gossip: Cache Message hash per Topic

substrate/core/test-client/src/lib.rs

@@ -20,8 +20,6 @@
 
 #![warn(missing_docs)]
 
-extern crate rhododendron;
-extern crate substrate_bft as bft;
 extern crate parity_codec as codec;
 extern crate substrate_primitives as primitives;
 extern crate sr_primitives as runtime_primitives;
@@ -35,7 +33,7 @@ pub mod client_ext;
 pub mod trait_tests;
 mod block_builder_ext;
 
-pub use client_ext::{TestClient, fake_justify};
+pub use client_ext::TestClient;
 pub use block_builder_ext::BlockBuilderExt;
 pub use client::blockchain;
 pub use client::backend;