Change block-common.sh on Linux to write physical-device-path with the
path of the device node, in addition to physical-device with its
major:minor numbers.
Signed-off-by: George Dunlap <george.dunlap@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com> Tested-by: George Dunlap <george.dunlap@citrix.com>