remove Center from Executor tests
remove Center from Executor tests

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