test unit tests and Python cleanliness

AP_BattMonitor: patch for fuel level calibration function from ottanoX #420

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Run time

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Job	Run time
build (base, unit-tests)	17m 49s
build (base, sitl)	25m 19s
build (clang, unit-tests)	19m 25s
build (clang, sitl)	24m 13s
	1h 26m 46s