SPARC_testing_script fails in quick_run mode on PACE-ICE and PACE-Phoenix

[ltimmerman3]

Tests are triggered by sparc command in form ./sparc -name <system> This causes a failure in MPI_Init(). Changing command to srun ./sparc -name <system> resolves issue, but will cause breakages on non-slurm clusters. Can add logic to identify cluster type and set command accordingly.