Add tests for 1d pndindex.
Add tests for 1d pndindex.

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