Imu health reporting and preflight checks improvements#12989

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dusan19 wants to merge 6 commits intoPX4:masterfrom dusan19:imu_health_reporting_improvements

+130-38

Commits on Sep 19, 2019

sensors: initialize the sensors as disabled, to avoid setting the priority other than 0 for disabled sensors
dusan19
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sensors: report sensor health change, according to the data validator state, using the subsystem_type that matches the sensor instance
dusan19
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uORB: extend vehicle_status message with imu_sensor_health, containing health flags for sensors sent by the sensors module,
dusan19
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uORB: extend vehicle_status msg with the preflight_checks_result,
dusan19
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Commander: run preflight checks on a regular period if the vehicle is unarmed
dusan19
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update ecl submodule with a method to get data validator state
dusan19
committed