udev: get rid of 'timestamp in the future' tar messages

udev: get rid of 'timestamp in the future' tar messages

This patch tries to get rid of spew of the useless tar messages durring boot
process on machines without RTC, such as the Beagleboard. Example:

Please wait: booting...
Starting udev
tar: dev/.udev/uevent_seqnum: time stamp 1970-01-01 01:00:21 is 14.122497521 s in the future
tar: dev/.udev/rules.d: time stamp 1970-01-01 01:00:07 is 0.119201623 s in the future
tar: dev/.udev/db/\x2fdevices\x2fvirtual\x2fblock\x2fram9: time stamp 1970-01-01 01:00:22 is 15.118713341 s in the future

[ more then 100 similar lines cutted off]

Signed-off-by: Petr Štetiar <ynezz@true.cz>
Acked-by: Chris Larson <clarson@mvista.com>
Signed-off-by: Philip Balister <philip@balister.org>