Move more params to the common section. (#6134)

* move common forks and parameters to common params

* port specs over to new format

* fix RPC tests

json/src/spec/spec.rs

@@ -61,12 +61,9 @@ mod tests {
 	"engine": {
 		"Ethash": {
 			"params": {
-				"gasLimitBoundDivisor": "0x0400",
 				"minimumDifficulty": "0x020000",
 				"difficultyBoundDivisor": "0x0800",
 				"durationLimit": "0x0d",
-				"blockReward": "0x4563918244F40000",
-				"registrar" : "0xc6d9d2cd449a754c494264e1809c50e34d64562b",
 				"homesteadTransition" : "0x",
 				"daoHardforkTransition": "0xffffffffffffffff",
 				"daoHardforkBeneficiary": "0x0000000000000000000000000000000000000000",
@@ -81,7 +78,8 @@ mod tests {
 		"minGasLimit": "0x1388",
 		"networkID" : "0x2",
 		"forkBlock": "0xffffffffffffffff",
-		"forkCanonHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
+		"forkCanonHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+		"gasLimitBoundDivisor": "0x20"
 	},
 	"genesis": {
 		"seal": {