def defer(self, opres):
        d = Deferred()
        opres.callback = d.callback

        def _on_err(mres, ex_type, ex_val, ex_tb):
            try:
                raise ex_type(ex_val)
            except CouchbaseError:
                d.errback()
        opres.errback = _on_err
        return d
returns the SHA-256 hash in hex of the test_id and kind
dataset/ETHPy150Open couchbase/couchbase-python-client/txcouchbase/bucket.py/RawBucket.defer--crossover with--dataset/ETHPy150Open datastax/cstar_perf/frontend/cstar_perf/frontend/lib/util.py/generate_object_id