Added a test for PlanningSceneInterface
Added a test for PlanningSceneInterface

Ensures that you can construct a PlanningSceneInterface without having to pass an explicit namespace.
ros-planning/moveit,ros-planning/moveit,ros-planning/moveit,davetcoleman/moveit,davetcoleman/moveit,davetcoleman/moveit,davetcoleman/moveit,ros-planning/moveit,ros-planning/moveit