all: Rename crypto.Sha3{,Hash}() to crypto.Keccak256{,Hash}()

As we aren't really using the standarized SHA-3

eth/downloader/queue.go

@@ -977,7 +977,7 @@ func (q *queue) DeliverNodeData(id string, data [][]byte, callback func(error, i
 	process := []trie.SyncResult{}
 	for _, blob := range data {
 		// Skip any state trie entires that were not requested
-		hash := common.BytesToHash(crypto.Sha3(blob))
+		hash := common.BytesToHash(crypto.Keccak256(blob))
 		if _, ok := request.Hashes[hash]; !ok {
 			errs = append(errs, fmt.Errorf("non-requested state data %x", hash))
 			continue

eth/handler_test.go

@@ -481,7 +481,7 @@ func testGetNodeData(t *testing.T, protocol int) {
 	}
 	// Verify that all hashes correspond to the requested data, and reconstruct a state tree
 	for i, want := range hashes {
-		if hash := crypto.Sha3Hash(data[i]); hash != want {
+		if hash := crypto.Keccak256Hash(data[i]); hash != want {
 			fmt.Errorf("data hash mismatch: have %x, want %x", hash, want)
 		}
 	}