Comment 9 for bug 1443542

This is believed to be fix-committed. under commit 205.
I removed a 'wipefs' which always calls blockdev --rereadpt. That would trigger deletion and recreation of partition devices.
We replaced it with 'wipe_partitions' which does not issue a rereadpt, but instead just zeros the front of the device.
Note, though, that in vivid and later, even a write to /dev/vdb1 does trigger kernel/udev events.