apply_to should be allowed to specify heterogenous pools

[jschwartzentruber]

Currently we require most fields to be identical for the whole set of apply_to configs.

orion/services/fuzzing-decision/src/fuzzing_decision/common/pool.py

Lines 693 to 707 in f0b0b0b

	# while these fields are not required to be defined here, they must be the same
	# for the entire set .. at least for now
	same_fields = (
	"cloud",
	"cores_per_task",
	"cpu",
	"cycle_time",
	"disk_size",
	"gpu",
	"imageset",
	"metal",
	"minimum_memory_per_core",
	"platform",
	"schedule_start",
	)

This allows a shortcut later on where those values are set in the parent pool to be used by the decision somehow (according to the comment).

orion/services/fuzzing-decision/src/fuzzing_decision/common/pool.py

Lines 714 to 715 in f0b0b0b

	# set the field on self, so it can easily be used by decision
	setattr(self, field, getattr(pools[0], field))

This shouldn't be necessary. It prevents us from creating a pool (eg. with macro COVERAGE=1) that applies to pools in disparate clouds or different OS'.