should use status instead of message

[ORESoftware]

   process.send({
        msg: 'done/return/to/pool',
        error: null,
        workId: workId,
        result: result
     });

should become:

   process.send({
        status: Pool.status.FINISHED,
        error: null,
        workId: workId,
        result: result
     });

or

   process.send({
        status: Pool.status.RECEIVED,
        error: null,
        workId: workId,
        result: result
     });