Tag the num_threads tests as long running
Tag the num_threads tests as long running

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