Store LastConsensusHash in State as well

Update all BlockValidation that it matches the last state

blockchain/reactor_test.go

@@ -112,7 +112,7 @@ func makeBlock(height int64, state *sm.State) *types.Block {
 	block, _ := types.MakeBlock(height, "test_chain", makeTxs(height),
 		state.LastBlockTotalTx, new(types.Commit),
 		prevBlockID, valHash, state.AppHash,
-		state.Params.Hash(),
+		state.LastConsensusHash,
 		state.Params.BlockGossipParams.BlockPartSizeBytes)
 	return block
 }