no_u_turn is ignored

[easbar]

https://discuss.graphhopper.com/t/curbside-right-and-turning-circles/7232/8

[easbar]

This is because the global u-turn costs overrule those set in the turn cost storage:

graphhopper/core/src/main/java/com/graphhopper/routing/weighting/DefaultTurnCostProvider.java

Lines 68 to 70 in 9f429cb

	if (edgeFrom == edgeTo) {
	// note that the u-turn costs overwrite any turn costs set in TurnCostStorage
	tCost = uTurnCosts;

... but that does not really make any sense? I think I put this comment there, but only because historically we always did it like this, probably because at one point we had several different 'u-turn' TraversalModes...