config_component.xml consolidation

Most of the variables defined in https://github.com/ESCOMP/CMEPS/blob/master/cime_config/config_component.xml are not specific to the cmeps driver and when a new variable is introduced in
one driver it can cause issues in the other drivers. In particular https://github.com/ESMCI/cime/pull/3989 adds two new variables to the mct driver and merging that PR will break CMEPS until those variables are added. My proposal is to put a file in cime which is not associated with any driver and that contains the intersection of the files currently in the mct and cmeps drivers.
I suggest creating a new directory cime/src/drivers/cime_config which contains this config_component.xml file and may contain other files common to all drivers.