use executor._gather rather than client._gather for Future
use executor._gather rather than client._gather for Future

dask/distributed,dask/distributed,mrocklin/distributed,mrocklin/distributed,blaze/distributed,amosonn/distributed,broxtronix/distributed,amosonn/distributed,broxtronix/distributed,amosonn/distributed,mrocklin/distributed,dask/distributed,broxtronix/distributed,dask/distributed,blaze/distributed