The RawBytesComparator in branch-1 have wrong comparison order

When digging the HBASE-22862, we found a bug in RawBytesComparator#compareOnlyKeyPortion (although it's unrelated to the corruption in HBASE-22862).

    @Override
    @VisibleForTesting
    public int compareOnlyKeyPortion(Cell left, Cell right) {
        // ...
      return (0xff & left.getTypeByte()) - (0xff & right.getTypeByte());
    }

Here should be (0xff & right.getTypeByte()) - (0xff & left.getTypeByte()) I think.

I can see the BloomFilter or HFile v2 are still using the comparator in branch-1 (but not in branch-2). Maybe we can just remove the class (if some HFile encoded with this comparator, then mapping to the correct KVComparator just like 2.x), or fix the bug in current RawBytesComparator.