crypto: fix Sha3Hash and add a test for it

crypto/crypto.go

@@ -42,7 +42,7 @@ func Sha3Hash(data ...[]byte) (h common.Hash) {
 	for _, b := range data {
 		d.Write(b)
 	}
-	d.Sum(h[:])
+	d.Sum(h[:0])
 	return h
 }