man: updates from upstream

Added upstream systemd-udevd.service(8) as udevd(8)

Authors include

	Tom Gundersen
	Zbigniew Jędrzejewski-Szmek
	Thomas Hindoe Paaboel Andersen
	Kay Sievers
	Lennart Poettering

See http://cgit.freedesktop.org/systemd/systemd/log/man/udev.xml
and http://cgit.freedesktop.org/systemd/systemd/log/man/systemd-udevd.service.xml
and http://cgit.freedesktop.org/systemd/systemd/log/man/udevadm.xml

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Signed-off-by: Ian Stakenvicius <axs@gentoo.org>