[PATCH] udev - advanced user query options

[PATCH] udev - advanced user query options

This patch improves the user options for udev.
It is possible now to query for the name, the symlinks or owner/group.
If asked for the name of the node we are able to prepend the udev_root
with the -r option.

SAMPLE:

  kay@pim:~/src/udev.test$ ./udev -V
  udev, version 012_bk

  kay@pim:~/src/udev.test$ ./udev -h
  Usage: [-qrVh]
    -q <name>  query database for the specified value
    -p <path>  device path used for query
    -r         print udev root
    -V         print udev version
    -h         print this help text

  kay@pim:~/src/udev.test$ ./udev -r
  /udev/

  kay@pim:~/src/udev.test$ ./udev -q name -p /class/video4linux/video0
  video/webcam0

  kay@pim:~/src/udev.test$ ./udev -q symlink -p /class/video4linux/video0
  camera0 kamera0

  kay@pim:~/src/udev.test$ ./udev -q owner -p /class/video4linux/video0
  501

  kay@pim:~/src/udev.test$ ./udev -r -q name -p /class/video4linux/video0
  /udev/video/webcam0