add explicit #SBATCH constraint (make_bcs_shared.py)

Without the explicit #SBATCH constraint, make_bcs.py jobs hang or fail on NCCS Discover SLES15 for unknown reasons.  Adding the explicit constraint somehow fixes this and should not hurt otherwise.

Author: gmao-rreichle

GEOSagcm_GridComp/GEOSphysics_GridComp/GEOSsurface_GridComp/Utils/Raster/makebcs/make_bcs_shared.py

@@ -15,6 +15,7 @@ def get_script_head() :
 #SBATCH --time=12:00:00
 #SBATCH --nodes=1
 #SBATCH --job-name={GRIDNAME2}.j
+#SBATCH --constraint=sky|cas|mil
 
 echo "-----------------------------" 
 echo "make_bcs starts date/time"