Update little obsolete/incorrect items

[cacraigucar]

Issue Type

Code Clean-up

Issue Description

From @gold2718: namelist_definition.xml 2406, 2643, 3017, 3047, 3103, 3115, 3158, 3214, 3270, 3591, 5028(!), : No CAM7? namelist_definition.xml 7095: Is prescribed_strataero_3modes used anymore? config_compsets.xml 16: No CAM7? config_compsets.xml 17: No CLM51 or CLM60?

Will this change answers?

No

Will you be implementing this yourself?

No