Keep the previous values for channels that are not updated (ghost protocol). Add new test data for ghost protocol.
Add test data for ghost protocol
This file is using a PX4IO-bound receiver on a DX9
Also cleanup other RC unit tests
* Low impact changes from path_cleanup branch. This is a step towards minimizing the diff with path_cleanup branch. * Update ecl. * Revert matrix update. * Revert ecl and matrix. * Update sitl gazebo. * Revert sitl_gazebo and matrix changes.