We have seen new cases where retrying to lock the device 3 times is not
enough. It's the same race we had experienced where Ceph tries to
acquire a lock on the device but systemd-udevd does the same too.
Retrying 20 times every 0.1sec seems to mitigate that issue in the CI.
Signed-off-by: Sébastien Han <seb@redhat.com>