Move the DHW parasitics to an EMS program

[joseph-robertson]

So that we can remove the "It is not possible to eliminate all DHW energy use (e.g. water heater parasitics) in EnergyPlus during an unavailable period." warning.

See similar approach for removing the "It is not possible to eliminate all HVAC energy use (e.g. crankcase/defrost energy) in EnergyPlus during an unavailable period." warning.