[PATCH] clean up start_udev a bit

First, update extras/start_udev.  udevstart always internally set
UDEV_NO_SLEEP as well as setting the ACTION variable, so that only needs
to be done in the run_udev script case.

Signed-off-by: Tom Rini <trini@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>