Fix the guvectorize tests to properly test parallelism
Fix the guvectorize tests to properly test parallelism

vectorized kernels aren't parallelized unless they have to do broadcasting
over a higher number of dimensions than they were compiled for.

cpcloud/numba,stuartarchibald/numba,IntelLabs/numba,seibert/numba,sklam/numba,sklam/numba,stonebig/numba,sklam/numba,stonebig/numba,sklam/numba,numba/numba,stuartarchibald/numba,sklam/numba,IntelLabs/numba,stuartarchibald/numba,stuartarchibald/numba,IntelLabs/numba,cpcloud/numba,gmarkall/numba,gmarkall/numba,stonebig/numba,cpcloud/numba,gmarkall/numba,numba/numba,numba/numba,seibert/numba,IntelLabs/numba,gmarkall/numba,seibert/numba,stonebig/numba,seibert/numba,cpcloud/numba,gmarkall/numba,stonebig/numba,cpcloud/numba,seibert/numba,IntelLabs/numba,numba/numba,stuartarchibald/numba,numba/numba