client: Use UUID symlink to find parcel device node
client: Use UUID symlink to find parcel device node

- Set VDISK_DEVICE to the path to the by-id symlink, rather than reading
parcelkeeper.dev to find the name of the device node

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr