ceph-disk: increase partprobe / udevadm settle timeouts

ceph-disk: increase partprobe / udevadm settle timeouts

The default of 120 seconds may be exceeded when the disk is very slow
which can happen in cloud environments. Increase it to 600 seconds
instead.

The partprobe command may fail for the same reason but it does not have
a timeout parameter. Instead, try a few times before failing.

The udevadm settle guarding partprobe are not necessary because
partprobe already does the same. However, partprobe does not provide a
way to control the timeout. Having a udevadm settle after another is
going to be a noop most of the time and not add any delay. It matters
when the udevadm settle run by partprobe fails with a timeout because
partprobe will silentely ignores the failure.

http://tracker.ceph.com/issues/14080 Fixes: #14080

Signed-off-by: Loic Dachary <loic@dachary.org>