Refactor key management (#3296)

* Add Call type to extensible transactions.

Cleanup some naming

* Merge Resource and BlockExhausted into just Exhausted

* Fix

* Another fix

* Call

* Some fixes

* Fix srml tests.

* Fix all tests.

* Refactor crypto so each application of it has its own type.

* Introduce new AuthorityProvider API into Aura

This will eventually allow for dynamic determination of authority
keys and avoid having to set them directly on CLI.

* Introduce authority determinator for Babe.

Experiment with modular consensus API.

* Work in progress to introduce KeyTypeId and avoid polluting API
with validator IDs

* Finish up drafting imonline

* Rework offchain workers API.

* Rework API implementation.

* Make it compile for wasm, simplify app_crypto.

* Fix compilation of im-online.

* Fix compilation of im-online.

* Fix more compilation errors.

* Make it compile.

* Fixing tests.

* Rewrite `keystore`

* Fix session tests

* Bring back `TryFrom`'s'

* Fix `srml-grandpa`

* Fix `srml-aura`

* Fix consensus babe

* More fixes

* Make service generate keys from dev_seed

* Build fixes

* Remove offchain tests

* More fixes and cleanups

* Fixes finality grandpa

* Fix `consensus-aura`

* Fix cli

* Fix `node-cli`

* Fix chain_spec builder

* Fix doc tests

* Add authority getter for grandpa.

* Test fix

* Fixes

* Make keystore accessible from the runtime

* Move app crypto to its own crate

* Update `Cargo.lock`

* Make the crypto stuff usable from the runtime

* Adds some runtime crypto tests

* Use last finalized block for grandpa authority

* Fix warning

* Adds `SessionKeys` runtime api

* Remove `FinalityPair` and `ConsensusPair`

* Minor governance tweaks to get it inline with docs.

* Make the governance be up to date with the docs.

* Build fixes.

* Generate the inital session keys

* Failing keystore is a hard error

* Make babe work again

* Fix grandpa

* Fix tests

* Disable `keystore` in consensus critical stuff

* Build fix.

* ImOnline supports multiple authorities at once.

* Update core/application-crypto/src/ed25519.rs

* Merge branch 'master' into gav-in-progress

* Remove unneeded code for now.

* Some `session` testing

* Support querying the public keys

* Cleanup offchain

* Remove warnings

* More cleanup

* Apply suggestions from code review

Co-Authored-By: Benjamin Kampmann <ben.kampmann@googlemail.com>

* More cleanups

* JSONRPC API for setting keys.

Also, rename traits::KeyStore* -> traits::BareCryptoStore*

* Bad merge

* Fix integration tests

* Fix test build

* Test fix

* Fixes

* Warnings

* Another warning

* Bump version.

substrate/core/state-machine/src/testing.rs

@@ -25,8 +25,9 @@ use crate::changes_trie::{
 	build_changes_trie, InMemoryStorage as ChangesTrieInMemoryStorage,
 	BlockNumber as ChangesTrieBlockNumber,
 };
-use primitives::offchain;
-use primitives::storage::well_known_keys::{CHANGES_TRIE_CONFIG, CODE, HEAP_PAGES};
+use primitives::{
+	storage::well_known_keys::{CHANGES_TRIE_CONFIG, CODE, HEAP_PAGES}, traits::BareCryptoStorePtr, offchain
+};
 use codec::Encode;
 use super::{ChildStorageKey, Externalities, OverlayedChanges};
 
@@ -40,6 +41,7 @@ pub struct TestExternalities<H: Hasher, N: ChangesTrieBlockNumber> {
 	backend: InMemory<H>,
 	changes_trie_storage: ChangesTrieInMemoryStorage<H, N>,
 	offchain: Option<Box<dyn offchain::Externalities>>,
+	keystore: Option<BareCryptoStorePtr>,
 }
 
 impl<H: Hasher, N: ChangesTrieBlockNumber> TestExternalities<H, N> {
@@ -84,6 +86,7 @@ impl<H: Hasher, N: ChangesTrieBlockNumber> TestExternalities<H, N> {
 			changes_trie_storage: ChangesTrieInMemoryStorage::new(),
 			backend: backend.into(),
 			offchain: None,
+			keystore: None,
 		}
 	}
 
@@ -263,6 +266,10 @@ impl<H, N> Externalities<H> for TestExternalities<H, N>
 			.as_mut()
 			.map(|x| &mut **x as _)
 	}
+
+	fn keystore(&self) -> Option<BareCryptoStorePtr> {
+		self.keystore.clone()
+	}
 }
 
 #[cfg(test)]