db: remove wal disabling / fast-and-loose option. (#8963)

* parity: highlight --fast-and-loose is not recommended.

* parity: remove fast-and-loose option, ref #1765

* db: remove db wal from options, it's always enabled

* db: remove wal from rocksdb helpers

* cli: fix wallet import test

* ethcore: fix client config tests

* parity: proper deprecated handling for fast-and-loose

* ethcore-client: fix config

* parity: mark fast-and-loose removed

* parity: fix test_find_deprecated

* parity: fix type for fast-and-loose flag

* lock file

ethcore/src/client/config.rs

@@ -102,8 +102,6 @@ pub struct ClientConfig {
 	pub db_cache_size: Option<usize>,
 	/// State db compaction profile
 	pub db_compaction: DatabaseCompactionProfile,
-	/// Should db have WAL enabled?
-	pub db_wal: bool,
 	/// Operating mode
 	pub mode: Mode,
 	/// The chain spec name
@@ -137,7 +135,6 @@ impl Default for ClientConfig {
 			name: "default".into(),
 			db_cache_size: None,
 			db_compaction: Default::default(),
-			db_wal: true,
 			mode: Mode::Active,
 			spec_name: "".into(),
 			verifier_type: VerifierType::Canon,