KAR-624 Remove xfail for trackstop test
Following release of the implementation of the TrackStop command on DishManager, this MR removes the xfail on this test and fixes a change on the pointingState
on the cpp DSSimulator.
This is accompanied with changes to the scenario in the feature file:
- Only have checks on the DSManager (DSSimulator cpp)
See command fanout and L2 requirement