Updated netlink code for linux kernel 2.6.18

   Updated netlink code to parse events that do not contain BUSNUM and DEVNUM but do have a DEVICE parameter.

 These netlink events are now parsed:

 add@/devices/platform/brcm-ohci-0.0/usb3/3-2/3-2:1.0
 ACTION=add
 DEVPATH=/devices/platform/brcm-ohci-0.0/usb3/3-2/3-2:1.0
 SUBSYSTEM=usb
 SEQNUM=290
 PHYSDEVBUS=usb
 DEVICE=/proc/bus/usb/003/003
 PRODUCT=45e/28e/114
 TYPE=255/255/255
 INTERFACE=255/93/1

 Also added a retry when opening the device file to work around a race condition with the kernel