RPC for importing geth keys (#1916)

* Address book for local addresses.

* Simple disk-backed address book.

* Add test and keep file with keys.

* View and import Geth keys.

* Fix test.

* Fix up author info.

[ci:skip]

parity/cli.rs

@@ -19,7 +19,7 @@ use docopt::Docopt;
 
 pub const USAGE: &'static str = r#"
 Parity. Ethereum Client.
-  By Wood/Paronyan/Kotewicz/Drwięga/Volf.
+  By Wood/Paronyan/Kotewicz/Drwięga/Volf et al.
   Copyright 2015, 2016 Ethcore (UK) Limited
 
 Usage:
@@ -67,7 +67,6 @@ Account Options:
   --keys-iterations NUM    Specify the number of iterations to use when
                            deriving key from the password (bigger is more
                            secure) [default: 10240].
-  --no-import-keys         Do not import keys from legacy clients.
   --force-signer           Enable Trusted Signer WebSocket endpoint used by
                            Signer UIs, even when --unlock is in use.
   --no-signer              Disable Trusted Signer WebSocket endpoint used by
@@ -248,6 +247,7 @@ Legacy Options:
   --testnet                Geth-compatible testnet mode. Equivalent to --chain
                            testnet --keys-path $HOME/parity/testnet-keys.
                            Overrides the --keys-path option.
+  --import-geth-keys       Attempt to import keys from Geth client.
   --datadir PATH           Equivalent to --db-path PATH.
   --networkid INDEX        Equivalent to --network-id INDEX.
   --peers NUM              Equivalent to --min-peers NUM.
@@ -310,7 +310,7 @@ pub struct Args {
 	pub flag_password: Vec<String>,
 	pub flag_keys_path: String,
 	pub flag_keys_iterations: u32,
-	pub flag_no_import_keys: bool,
+	pub flag_import_geth_keys: bool,
 	pub flag_bootnodes: Option<String>,
 	pub flag_network_id: Option<String>,
 	pub flag_pruning: String,

parity/configuration.rs

@@ -310,7 +310,7 @@ impl Configuration {
 	fn accounts_config(&self) -> Result<AccountsConfig, String> {
 		let cfg = AccountsConfig {
 			iterations: self.args.flag_keys_iterations,
-			import_keys: !self.args.flag_no_import_keys,
+			import_keys: self.args.flag_import_geth_keys,
 			testnet: self.args.flag_testnet,
 			password_files: self.args.flag_password.clone(),
 			unlocked_accounts: try!(to_addresses(&self.args.flag_unlock)),

parity/params.rs

@@ -167,7 +167,7 @@ impl Default for AccountsConfig {
 	fn default() -> Self {
 		AccountsConfig {
 			iterations: 10240,
-			import_keys: true,
+			import_keys: false,
 			testnet: false,
 			password_files: Vec::new(),
 			unlocked_accounts: Vec::new(),