[NDISUIO]

- Handle IOCTL_NDISUIO_OPEN_WRITE_DEVICE and IOCTL_NDISUIO_OPEN_DEVICE properly with regard to current open handles
- Check that we have read permissions (opened by IOCTL_NDISUIO_OPEN_DEVICE) before allowing queries or reads

svn path=/branches/wlan-bringup/; revision=54819