Fix relative pose for sync mode

[KevinLADLee]

Fixes #559 .

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This change is 

[lasuomela]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @KevinLADLee)

[berndgassmann]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @KevinLADLee)

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carla_ros_bridge/src/carla_ros_bridge/actor_factory.py, line 115 at r1 (raw file):

            carla_actor = self.world.get_actor(actor_id)
            if self.node.parameters["register_all_sensors"] or not isinstance(carla_actor, carla.Sensor):
                self._create_object_from_actor(carla_actor, None)

I guess you are spawning the vehicles via the ros-bridge. Did you also test your code when vehicles and sensors are spawned e.g. via manual_control? Because then, this code is called. In this case the TF will become wrong, because then you would at least have to keep the realative calculations in respect to the parent which you delete completely below.
I've just created a PR #571 that fixes the root-cause for the issue and give the CARLA server a tick before consuming the data.

[KevinLADLee]

#571 fixes the root cause for the issue. Closed this pr.