Update to latest kvdb-*: no default column, DBValue is Vec (#11312)

* Only use kvdb "column families"

This PR contains the changes necessary to use the `kvdb-*` crates from https://github.com/paritytech/parity-common/pull/278 (so a synchronized merge is required) which drops support for the old-style rocksdb "default" column to get a smaller and less complex API.

As it stands this PR is working correctly except for secret-store; we need to migrate it to use a new column family.

* Fix secretstore build

* Fix secretstore build: include ethkey when building with the "accounts" feature

* typos

* Restore state test commit

* Override all of parity-common from git

* Be precise about version requirement to migrate secretstore code

* Update ethcore/db/src/db.rs

Co-Authored-By: Niklas Adolfsson <niklasadolfsson1@gmail.com>

* Address review grumbles

* Review grumbles

* Cleanup

Co-authored-by: Niklas Adolfsson <niklasadolfsson1@gmail.com>

ethcore/sync/src/light_sync/tests/test_net.rs

@@ -235,11 +235,11 @@ impl TestNet<Peer> {
 			// skip full verification because the blocks are bad.
 			config.verify_full = false;
 			let cache = Arc::new(Mutex::new(Cache::new(Default::default(), Duration::from_secs(6 * 3600))));
-			let db = kvdb_memorydb::create(0);
+			let db = kvdb_memorydb::create(1);
 			let client = LightClient::new(
 				config,
 				Arc::new(db),
-				None,
+				0,
 				&spec::new_test(),
 				fetch::unavailable(), // TODO: allow fetch from full nodes.
 				IoChannel::disconnected(),