Live-resize boot disk on SCSI

[vholer]

When boot disk is on SCSI, the udev rule to trigger recontextualization doesn't match.

Following (very first) event is triggered

• on vda

DEV  [708.402779] change   /devices/pci0000:00/0000:00:05.0/virtio2/block/vda (block)
.ID_FS_TYPE_NEW=
ACTION=change
DEVLINKS=/dev/disk/by-path/virtio-pci-0000:00:05.0 /dev/disk/by-path/pci-0000:00:05.0
DEVNAME=/dev/vda
DEVPATH=/devices/pci0000:00/0000:00:05.0/virtio2/block/vda
DEVTYPE=disk
ID_FS_TYPE=
ID_PART_TABLE_TYPE=gpt
ID_PART_TABLE_UUID=d16641c8-30be-4427-b640-a38b17b7d48e
ID_PATH=pci-0000:00:05.0
ID_PATH_TAG=pci-0000_00_05_0
MAJOR=252
MINOR=0
RESIZE=1
SEQNUM=3975
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=927891
net.ifnames=0

• on sda

UDEV  [548.130689] change   /devices/pci0000:00/0000:00:04.0/virtio1/host2/target2:0:0/2:0:0:0 (scsi)
ACTION=change
DEVPATH=/devices/pci0000:00/0000:00:04.0/virtio1/host2/target2:0:0/2:0:0:0
DEVTYPE=scsi_device
DRIVER=sd
MODALIAS=scsi:t-0x00
SDEV_UA=CAPACITY_DATA_HAS_CHANGED
SEQNUM=3939
SUBSYSTEM=scsi
USEC_INITIALIZED=913676
net.ifnames=0