udev rules access deprecated power/level attribute in sysfs

[Ben Hutchings]

The udev rules include the following:

data/rules/56-hpmud_sysfs.rules:ENV{libsane_matched}=="yes", RUN+="/bin/sh -c 'test -e /sys/$env{DEVPATH}/power/level && echo on > /sys/$env{DEVPATH}/power/level'"
data/rules/56-hpmud.rules:ENV{libsane_matched}=="yes", RUN+="/bin/sh -c 'test -e /sys/$env{DEVPATH}/power/level && echo on > /sys/$env{DEVPATH}/power/level'"

The power/level attribute has been deprecated since Linux 2.6.35 in favour of the power/control attribute which is not specific to USB. Any access results in a warning in the kernel log.