aux_cdeps test for DATAMODELTEST compset fails

[ekluzek]

There is a test in aux_cdeps that uses a DATAMODELTEST compset that fails because it's not defined.

This came up in testing for PRs: #343 #331 #322

The simple fix would be to delete the test, but we also don't know it's purpose and perhaps the compset should be changed?

It looks like the problem is that cime_config/config_compsets.xml was added in f90b42e and then deleted in: 302c33f

@jedwards4b can you figure out the right thing to do here?

[jedwards4b]

Remove those tests, we decided not to do this.

[ekluzek]

This means removing the tests that include DATAMODELTEST for the compset from:

dglc/cime_config/testdefs/testlist_dglc.xml