Refactor parfors tests into many small groups
Refactor parfors tests into many small groups

As title

IntelLabs/numba,seibert/numba,numba/numba,IntelLabs/numba,IntelLabs/numba,numba/numba,IntelLabs/numba,numba/numba,cpcloud/numba,numba/numba,cpcloud/numba,seibert/numba,cpcloud/numba,seibert/numba,seibert/numba,numba/numba,cpcloud/numba,IntelLabs/numba,cpcloud/numba,seibert/numba