Refactor Scheduler imports.
Refactor Scheduler imports.

ssanderson/dask,mraspaud/dask,blaze/dask,jakirkham/dask,vikhyat/dask,mrocklin/dask,dask/dask,jcrist/dask,clarkfitzg/dask,jcrist/dask,jayhetee/dask,pombredanne/dask,mrocklin/dask,jakirkham/dask,PhE/dask,PhE/dask,wiso/dask,dask/dask,cowlicks/dask,ssanderson/dask,mikegraham/dask,jayhetee/dask,blaze/dask,ContinuumIO/dask,chrisbarber/dask,pombredanne/dask,wiso/dask,cpcloud/dask,simudream/dask,gameduell/dask,ContinuumIO/dask,clarkfitzg/dask,simudream/dask,vikhyat/dask,mraspaud/dask