osm2ed: fix import of blind alley
osm2ed: fix import of blind alley

We were only importing edge with nodes used at least by two edges, but
in case of blind alley we need this edges too, so, we now import all
edges from a street even is they are used only one time!

fueghan/navitia,francois-vincent/navitia,thiphariel/navitia,francois-vincent/navitia,TeXitoi/navitia,kinnou02/navitia,Tisseo/navitia,kinnou02/navitia,antoine-de/navitia,VincentCATILLON/navitia,ballouche/navitia,frodrigo/navitia,CanalTP/navitia,VincentCATILLON/navitia,thiphariel/navitia,fueghan/navitia,CanalTP/navitia,CanalTP/navitia,is06/navitia,is06/navitia,antoine-de/navitia,kadhikari/navitia,xlqian/navitia,TeXitoi/navitia,patochectp/navitia,patochectp/navitia,TeXitoi/navitia,frodrigo/navitia,ballouche/navitia,lrocheWB/navitia,kadhikari/navitia,VincentCATILLON/navitia,TeXitoi/navitia,is06/navitia,xlqian/navitia,pbougue/navitia,pbougue/navitia,francois-vincent/navitia,prhod/navitia,lrocheWB/navitia,Tisseo/navitia,lrocheWB/navitia,fueghan/navitia,kadhikari/navitia,CanalTP/navitia,frodrigo/navitia,xlqian/navitia,lrocheWB/navitia,thiphariel/navitia,prhod/navitia,xlqian/navitia,prhod/navitia,kadhikari/navitia,CanalTP/navitia,fueghan/navitia,is06/navitia,ballouche/navitia,VincentCATILLON/navitia,patochectp/navitia,xlqian/navitia,Tisseo/navitia,francois-vincent/navitia,ballouche/navitia,kinnou02/navitia,kinnou02/navitia,Tisseo/navitia,pbougue/navitia,pbougue/navitia,patochectp/navitia,thiphariel/navitia,antoine-de/navitia,Tisseo/navitia,frodrigo/navitia,antoine-de/navitia,prhod/navitia