[Bug 1838992] [NEW] udev doesn't pick up volumes properly

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[Only happens on Ubuntu, not other OS's, like Debian]

When we are attaching a volume to a running Ubuntu server (using
kvm/libvirt), most of the time the udev rules are not properly
triggered. In the end the volume will most of the time not be available
in `/dev/disk/by-id/virtio-<ID_SERIAL>`. Sometimes it works though
(10%/20%?).

The reason for this is that udev somehow doesn't pick it up when the
volume is attached. It looks like a timing issue. Just looking at
`/sys/devices/pci0000:00/0000:00:05.0/virtio2/block/vdb/serial` makes it
clear that it's there. However `udevadm info /dev/vdb` returns without
the `ID_SERIAL` key. Only a `udevadm trigger` leads to a correct entry
of `ID_SERIAL` and also fixes `/dev/disk/by-id`.

We are a small cloud provider (cloudscale.ch). We have tested this on
Ubuntu (16.04/18.04), Debian 9, CentOS, CoreOS. We haven't tested this
extensively, but it sure looks like it's only happening on Ubuntu. . We
never had any issues reported on other OS's about this.

I tried looking at the differences of Debian and Ubuntu udev packages,
but couldn't figure out what might be responsible for this behavior.

If someone needs an account for our control panel to reproduce this,
please contact me, I'm happy to give you the resources to debug this.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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udev doesn't pick up volumes properly
https://bugs.launchpad.net/bugs/1838992
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