We use udev within these containers and we prevent the /dev files
to be created with the cgroup whitelist. So when the udevd receives
the event from the kernel, it will fail to create some nodes in /dev
and will spit error on the console.

We set the log level to zero, so udev will silently fail.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>