cam6_4_076: Change cam7 testing to use MOM t232 mask.

[brian-eaton]

Resolves #1236 - Change our testing from using the POP land/ocean mask to the MOM t232 land/ocean mask

• The cam7 tests using the ne30pg3_ne30pg3_mg17 grid have been updated to
  use ne30pg3_ne30pg3_mt232.
• One test used the f19_f19 grid which used the gx1v6 mask. That test is
  updated to use f19_f19_mg17.

[adamrher]

Can we (should we?) change all ne30pg3_ne30pg3_mg17 tests to ne30pg3_ne30pg3_mt232, and not just aux_cam / prealpha tests? I'm referring to these carma, aux_pumas, waccm, camchem, zmean_nudging categories in testlist_cam.xml. I think it would make sense to convert these all at once.

[brian-eaton]

Hi Adam. I've been trying to take a more incremental approach so that I don't bother changing tests now that may just end up being removed. Also, with respect to this particular PR, I may need to turn this around quickly with an update to the ccs_config_cesm external further than what I currently need. So I'd prefer not to add more test changes right now.

[cacraigucar]

Since not all the tests are being updated right now, should we make sure to keep the issue open (change the "resolves" to "partial updates" or open an new issue?

[brian-eaton]

I'll open a new issue.

[cacraigucar]

Approving, but reminding that we need a new issue to replace the one which this PR is closing.