Postpone Constantinople (#574)

Remove old 7_080_000 block designation for mainnet Constantinople
update tests
Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

config/src/main/resources/mainnet.json

@@ -9,7 +9,6 @@
     "eip155Block": 2675000,
     "eip158Block": 2675000,
     "byzantiumBlock": 4370000,
-    "constantinopleBlock": 7080000,
     "ethash": {
 
     }

ethereum/core/src/test/java/tech/pegasys/pantheon/ethereum/mainnet/MainnetProtocolScheduleTest.java

@@ -38,9 +38,9 @@ public class MainnetProtocolScheduleTest {
         .isEqualTo("TangerineWhistle");
     Assertions.assertThat(sched.getByBlockNumber(2_675_000L).getName()).isEqualTo("SpuriousDragon");
     Assertions.assertThat(sched.getByBlockNumber(4_730_000L).getName()).isEqualTo("Byzantium");
-    Assertions.assertThat(sched.getByBlockNumber(7_080_000L).getName()).isEqualTo("Constantinople");
-    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName())
-        .isEqualTo("Constantinople");
+    // Constantinople was originally scheduled for 7_080_000, but postponed
+    Assertions.assertThat(sched.getByBlockNumber(7_080_000L).getName()).isEqualTo("Byzantium");
+    Assertions.assertThat(sched.getByBlockNumber(Long.MAX_VALUE).getName()).isEqualTo("Byzantium");
   }
 
   @Test