Need for a new compset naming convention

I would like to add a new component to cesm and thus to cime for the cmeps driver. This component would be optional and only initially needed for a few compsets. I do not want to repeat the experience of adding the IAC and ESP components which have created a bit of spaghetti code in this repository and in cime. The current compset naming convention is documented [here. ](https://github.com/ESCOMP/CMEPS/blob/master/cime_config/config_compsets.xml#L6)