updated exception and error message when we fail to discover
instrument state.
case ciswmi-157.  Added code to intrupt test commands when coming
out of DA
Created new driver; High Tech LF Hydrophone
Replaced InstrumentDriverDataParticleMixin with DriverTestMixin as per Roger
Unwin's suggestion.
HYDLF first stab at driver
Updating driver per billys feedback
HYDLF driver ongoing dev
note about channel name matching
Added orb through protocol integration test
Run port agent antelope in subprocess
Changed perf test to return samples/sec
Use yappi for multithreaded profiling