Consensus Engines Implementation: Aura (#911)

* Generalize BlockImport

 - move ImportBlock, BlockOrigin, ImportResult into shared sr-primitives
 - let Consensus provide  and  traits again
 - update consensus traits to latest development
 - implement traits on client::Client, test_client::TestClient
 - update RHD to use the new import_block API

* Move ImportBlock into consensus-common
* Send import notification in aura tests
* Integrating aura into service
* Make Signatures more generic
* Aura Block Production with the given key
* run aura on the thread pool
* start at exact step start in aura
* Add needed wasm blob, in leiu of better solutions.
* Make API ids consistent with traits and bring upstream for sharing.
* Add decrease_free_balance to Balances module
* Encode `Metadata` once instead of two times
* Bitops include xor
* Upgrade key module.
* Default pages to somewhat bigger.
* Introduce upgrade key into node
* Add `Created` event

substrate/core/rpc/src/chain/tests.rs

@@ -16,9 +16,9 @@
 
 use super::*;
 use jsonrpc_macros::pubsub;
-use client::BlockOrigin;
 use test_client::{self, TestClient};
 use test_client::runtime::{Block, Header};
+use consensus::BlockOrigin;
 
 #[test]
 fn should_return_header() {

substrate/core/rpc/src/lib.rs

@@ -47,6 +47,8 @@ extern crate hex_literal;
 #[cfg(test)]
 extern crate substrate_test_client as test_client;
 #[cfg(test)]
+extern crate substrate_consensus_common as consensus;
+#[cfg(test)]
 extern crate rustc_hex;
 
 mod errors;

substrate/core/rpc/src/state/tests.rs

@@ -17,7 +17,7 @@
 use super::*;
 use self::error::{Error, ErrorKind};
 
-use client::BlockOrigin;
+use consensus::BlockOrigin;
 use jsonrpc_macros::pubsub;
 use rustc_hex::FromHex;
 use test_client::{self, runtime, keyring::Keyring, TestClient, BlockBuilderExt};