Hardfork the testnets (#9562)

* ethcore: propose hardfork block number 4230000 for ropsten

* ethcore: propose hardfork block number 9000000 for kovan

* ethcore: enable kip-4 and kip-6 on kovan

* etcore: bump kovan hardfork to block 9.2M

* ethcore: fix ropsten constantinople block number to 4.2M

* ethcore: disable difficulty_test_ropsten until ethereum/tests are updated upstream

ethcore/res/ethereum/kovan.json

@@ -43,7 +43,13 @@
 		"eip211Transition": 5067000,
 		"eip214Transition": 5067000,
 		"eip658Transition": 5067000,
-		"wasmActivationTransition": 6600000
+		"wasmActivationTransition": 6600000,
+		"eip145Transition": 9200000,
+		"eip1014Transition": 9200000,
+		"eip1052Transition": 9200000,
+		"eip1283Transition": 9200000,
+		"kip4Transition": 9200000,
+		"kip6Transition": 9200000
 	},
 	"genesis": {
 		"seal": {

ethcore/res/ethereum/ropsten.json

@@ -12,7 +12,7 @@
 				"eip100bTransition": 1700000,
 				"eip649Transition": 1700000,
 				"eip649Reward": "0x29A2241AF62C0000",
-				"eip1234Transition": "0x7fffffffffffff",
+				"eip1234Transition": 4200000,
 				"eip1234Reward": "0x1BC16D674EC80000"
 			}
 		}
@@ -37,7 +37,11 @@
 		"eip140Transition": 1700000,
 		"eip211Transition": 1700000,
 		"eip214Transition": 1700000,
-		"eip658Transition": 1700000
+		"eip658Transition": 1700000,
+		"eip145Transition": 4200000,
+		"eip1014Transition": 4200000,
+		"eip1052Transition": 4200000,
+		"eip1283Transition": 4200000
 	},
 	"genesis": {
 		"seal": {

ethcore/src/json_tests/difficulty.rs

@@ -75,3 +75,19 @@ mod difficulty_test_foundation {
 
 	declare_test!{DifficultyTests_difficultyMainNetwork, "BasicTests/difficultyMainNetwork.json"}
 }
+
+// Disabling Ropsten diff tests; waiting for upstream ethereum/tests Constantinople update
+//mod difficulty_test_ropsten {
+//	difficulty_json_test_nopath!(new_ropsten_test);
+//	declare_test!{DifficultyTests_difficultyRopsten, "BasicTests/difficultyRopsten.json"}
+//}
+
+mod difficulty_test_frontier {
+	difficulty_json_test_nopath!(new_frontier_test);
+	declare_test!{DifficultyTests_difficultyFrontier, "BasicTests/difficultyFrontier.json"}
+}
+
+mod difficulty_test_homestead {
+	difficulty_json_test_nopath!(new_homestead_test);
+	declare_test!{DifficultyTests_difficultyHomestead, "BasicTests/difficultyHomestead.json"}
+}