message: fix python behavior model
diff: @@ -23,8 +23,9 @@ class PythonDistanceBehavior(BehaviorModel):
  """
  def __init__(self, params = None):
  super(PythonDistanceBehavior, self).__init__(params)
  + self._params = params
  self._distance_range_constant_acceleration = \
  - self.params["PythonDistanceBehavior::RangeConstantVelocity", \
  + self._params["PythonDistanceBehavior::RangeConstantVelocity", \
  "Range in meters defining when controlled vehicle does not change velocity", [10, 20]]
  def Plan(self, delta_time, observed_world):
  