adjust sizeof test for py27
adjust sizeof test for py27

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