Replace ethcore-logger with env-logger. (#10102)

* Replace ethcore-logger with env-logger.

* Fix logger initialization in WASM tests.

* uncomment logger initialization in secret store

* Don't use ethcore-logger in whisper.

* Move ethcore-logger within parity dir.

* Uncomment rest from secret-store.

* Use `let _ =` in private_contract for consistency

* `ok()` to `let _ =` fix in service

* Use `let _ = ` for state_db

ethcore/src/state/mod.rs

@@ -1316,7 +1316,6 @@ mod tests {
 	use vm::EnvInfo;
 	use spec::*;
 	use types::transaction::*;
-	use ethcore_logger::init_log;
 	use trace::{FlatTrace, TraceError, trace};
 	use evm::CallType;
 
@@ -1332,7 +1331,7 @@ mod tests {
 
 	#[test]
 	fn should_apply_create_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1372,7 +1371,7 @@ mod tests {
 
 	#[test]
 	fn should_work_when_cloned() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let a = Address::zero();
 
@@ -1390,7 +1389,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_failed_create_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1426,7 +1425,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_call_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1468,7 +1467,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_basic_call_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1509,7 +1508,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_call_transaction_to_builtin() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1550,7 +1549,7 @@ mod tests {
 
 	#[test]
 	fn should_not_trace_subcall_transaction_to_builtin() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1592,7 +1591,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_callcode_properly() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1650,7 +1649,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_delegatecall_properly() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1709,7 +1708,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_failed_call_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1748,7 +1747,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_call_with_subcall_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1807,7 +1806,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_call_with_basic_subcall_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1861,7 +1860,7 @@ mod tests {
 
 	#[test]
 	fn should_not_trace_call_with_invalid_basic_subcall_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1903,7 +1902,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_failed_subcall_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -1958,7 +1957,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_call_with_subcall_with_subcall_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -2032,7 +2031,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_failed_subcall_with_subcall_transaction() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();
 
@@ -2104,7 +2103,7 @@ mod tests {
 
 	#[test]
 	fn should_trace_suicide() {
-		init_log();
+		let _ = env_logger::try_init();
 
 		let mut state = get_temp_state();