+ o drop support for node names in name stack, support only symlinks
+ With well defined and kernel-supplied node names, we no longer need
+ to support a possible stack of conflicting symlinks and node names.
+ From there on, only symlinks with identical names can be claimed
+ by multiple devices. It will simplify the logic a lot and shrink
+ /dev/.udev/names/ significantly. Also exclude "*/MAJ:MIN" link names
+ from the name stack, they can not conflict.
+ o remove most NAME= rules (they are provided by the 2.6.31 kernel)