times out because of no dbus

Given this command line:
BOOT_IMAGE=ubuntu/amd64/hwe-y/yakkety/daily/boot-kernel nomodeset iscsi_target_name=iqn.2004-05.com.ubuntu:maas:ephemeral-ubuntu-amd64-hwe-y-yakkety-daily iscsi_target_ip=2001:67c:1562:8010::2:1 iscsi_target_port=3260 iscsi_initiator=kearns ip=::::kearns:BOOTIF ro root=/dev/disk/by-path/ip-2001:67c:1562:8010::2:1:3260-iscsi-iqn.2004-05.com.ubuntu:maas:ephemeral-ubuntu-amd64-hwe-y-yakkety-daily-lun-1 overlayroot=tmpfs cloud-config-url=http://maas-boot-vm-xenial.dt-maas:5240/MAAS/metadata/latest/by-id/8w4gkk/?op=get_preseed log_host=maas-boot-vm-xenial.dt-maas log_port=514 --- console=ttyS1 BOOTIF=01-38:63:bb:43:b8:bc

Where:
root@ubuntu:~# host maas-boot-vm-xenial.dt-maas
maas-boot-vm-xenial.dt-maas is an alias for maas-boot-vm-xenial.maas.
maas-boot-vm-xenial.maas has address 10.246.0.5
maas-boot-vm-xenial.maas has IPv6 address 2001:67c:1562:8010::2:1

cloud-init takes "forever" to run, because there is a 25 second pause every time it tries to report status to the maas server. This is because hostname resolution assumes a working dbus, and takes 25 seconds to timeout on connecting to dbus to get the answer.

Related bugs:
 * bug 1611074: Reformatting of ephemeral drive fails on resize of Azure VM