remap_restarts should use SLURM for lake/landice/saltwater

[mathomp4]

In trying to move my nightly tests to SLES15, something interesting was found. Namely, the remap_upper.py and remap_catchANDcn.py scripts create SLURM jobs and submit them. But remap_lake_landice_saltwater.py does not. Rather, it just runs on the node where you are running.

Now, perhaps these jobs are small enough that even at very-high resolution this doesn't matter hardware-wise, but my nightly tests were used to regrid.pl where everything was done in SLURM if you weren't on compute nodes.

My "solution" for now is I load g5_modules in my testing scripts but this is not ideal as eventually these jobs will run on discover-cron which isn't exactly a big node usually as it just manages cron.