driver strategy: handle the case that an underload may happen and the clutch is already re-engaged -> use engaged action

in case the simulation interval is short (<0.05s) due to other conditions (driving cycle speed change, driving action distance reached, ...) allow extending the traction interruption to avoid high inertia torque and thus extrapolation of loss-maps

cause of the error: a short simulation interval occurs because braking to the next but one target speed (stop) starts slightly before the next target speed change. thus the simulation first goes to the distance where braking has to start and then simulates the short distance to the next target speed (as we do not cross target speed changes)
solution: allow simulating over a target speed change if the distance to the next target speed change is short and the vehicle is already below the next target speed.

(cherry picked from commit e3e14109)

adding testcase illustrating vtp bug: vtp factor for same vehicle is different although the same model data is used (only the fuel type was changed to CNG)