Update header hash calc in slashing test (#10397)

* Using gasLimit in hash if present

to make the slasher test work when gasLimit is added to the header in
celo-org/celo-blockchain#2062. This function
will change again as part of
celo-org/celo-blockchain-planning#100.

* Use constant header fields in hash if present

Related to celo-org/celo-blockchain#2124

* Update header hashing for eth compat

Required to support both old headers and Eth-compatible headers.
See celo-org/celo-blockchain-planning#100

packages/celotool/src/e2e-tests/slashing_tests.ts

@@ -18,17 +18,38 @@ const TMP_PATH = '/tmp/e2e'
 const safeMarginBlocks = 4
 
 function headerArray(block: any) {
+  if (!block.nonce) {
+    // Before Gingerbread fork
+    return [
+      block.parentHash,
+      block.miner,
+      block.stateRoot,
+      block.transactionsRoot,
+      block.receiptsRoot,
+      block.logsBloom,
+      block.number,
+      block.gasUsed,
+      block.timestamp,
+      block.extraData,
+    ]
+  }
   return [
     block.parentHash,
+    block.sha3Uncles,
     block.miner,
     block.stateRoot,
     block.transactionsRoot,
     block.receiptsRoot,
     block.logsBloom,
+    new BigNumber(block.difficulty).toNumber(),
     block.number,
+    block.gasLimit,
     block.gasUsed,
     block.timestamp,
     block.extraData,
+    block.mixHash,
+    block.nonce,
+    block.baseFee,
   ]
 }