Lays out the framework for effective instrument->DM testing
Basic layout for instrument->DM

I need another supporting structure for each of the parameter types and
unfortunately what I really need is a simulator that produces a TON of
this stuff and a driver.
Merge branch 'dm_instrument' of https://github.com/lukecampbell/coi-services into HEAD

Conflicts:
	ion/services/dm/test/dm_test_case.py