Confirm that cloud-init has not created any regressions in our CI:

maas-integration.TestMAASIntegration.test_create_admin ... ok
maas-integration.TestMAASIntegration.test_restart_dbus_avahi ... SKIP: Avahi/DBUS are not used anymore
maas-integration.TestMAASIntegration.test_update_maas_url ... ok
maas-integration.TestMAASIntegration.test_update_maas_url_rack ... ok
maas-integration.TestMAASIntegration.test_check_initial_services_systemctl ... ok
maas-integration.TestMAASIntegration.test_check_rpc_info ... ok
maas-integration.TestMAASIntegration.test_update_preseed_arm ... SKIP: Don't test ARM nodes
maas-integration.TestMAASIntegration.test_login_api ... ok
maas-integration.TestMAASIntegration.test_maas_logged_in ... ok
maas-integration.TestMAASIntegration.test_set_main_archive ... ok
maas-integration.TestMAASIntegration.test_main_archive_in_enlist_userdata_package_mirrors_config ... SKIP: Cloud-init "package_mirror" config is used in MAAS 2.0 and earlier
maas-integration.TestMAASIntegration.test_main_archive_in_enlist_userdata_apt_config ... ok
maas-integration.TestMAASIntegration.test_set_http_proxy ... ok
maas-integration.TestMAASIntegration.test_add_ssh_key ... ok
maas-integration.TestMAASIntegration.test_region_rack_connected ... ok
maas-integration.TestMAASIntegration.test_stop_image_import ... ok
maas-integration.TestMAASIntegration.test_set_custom_boot_source ... ok
maas-integration.TestMAASIntegration.test_add_boot_source_selection_xenial ... SKIP: Not adding Xenial images as we are already running in Xenial
maas-integration.TestMAASIntegration.test_add_boot_source_selection_ppc64el ... SKIP: Not testing PPC systems
maas-integration.TestMAASIntegration.test_add_boot_source_selection_arm64 ... SKIP: Not testing arm64 systems
maas-integration.TestMAASIntegration.test_add_boot_source_selection_centos ... SKIP: Not testing CentOS. Testing custom images repository.
maas-integration.TestMAASIntegration.test_start_image_import ... ok
maas-integration.TestMAASIntegration.test_create_dynamic_range ... ok
maas-integration.TestMAASIntegration.test_reserve_bmc_range ... ok
maas-integration.TestMAASIntegration.test_create_slave_device_and_link_subnet ... ok
maas-integration.TestMAASIntegration.test_slave_device_interface_linked ... ok
maas-integration.TestMAASIntegration.test_set_up_dhcp_vlan ... ok
maas-integration.TestMAASIntegration.test_check_dhcp_service_systemctl ... ok
maas-integration.TestMAASIntegration.test_update_dns_config_systemctl ... ok
maas-integration.TestMAASIntegration.test_add_new_zones ... ok
maas-integration.TestMAASIntegration.test_list_zones ... ok
maas-integration.TestMAASIntegration.test_delete_zone ... ok
maas-integration.TestMAASIntegration.test_add_new_spaces ... ok
maas-integration.TestMAASIntegration.test_create_subnet ... ok
maas-integration.TestMAASIntegration.test_list_spaces ... ok
maas-integration.TestMAASIntegration.test_list_subnets ... ok
maas-integration.TestMAASIntegration.test_delete_subnet ... ok
maas-integration.TestMAASIntegration.test_delete_space ... ok
maas-integration.TestMAASIntegration.test_add_new_fabrics ... ok
maas-integration.TestMAASIntegration.test_add_vlan_to_fabric ... ok
maas-integration.TestMAASIntegration.test_list_fabrics ... ok
maas-integration.TestMAASIntegration.test_list_vlans ... ok
maas-integration.TestMAASIntegration.test_delete_vlan ... ok
maas-integration.TestMAASIntegration.test_delete_fabric ... ok
maas-integration.TestMAASIntegration.test_region_imported_images ... ok
maas-integration.TestMAASIntegration.test_rack_imported_images ... ok
maas-integration.TestMAASIntegration.test_add_windows_boot_resource ... SKIP: Not testing Windows
maas-integration.TestMAASIntegration.test_add_rhel_boot_resource ... SKIP: Not testing RHEL
maas-integration.TestMAASIntegration.test_set_xenial_as_default_distro_series ... SKIP: Not setting Xenial as default_distro_series as we only need it in 2.4
maas-integration.TestMAASIntegration.test_poweron_nodes_to_enlist ... ok
maas-integration.TestMAASIntegration.test_check_machines_new ... ok
maas-integration.TestMAASIntegration.test_assign_machines_to_test_zone ... ok
maas-integration.TestMAASIntegration.test_set_machines_ipmi_config ... ok
maas-integration.TestMAASIntegration.test_start_commissioning_machines ... ok
maas-integration.TestMAASIntegration.test_check_nodes_ready ... ok
maas-integration.TestMAASIntegration.test_read_commissioning_results ... ok
maas-integration.TestMAASIntegration.test_configure_juju ... SKIP: Not testing juju
maas-integration.TestMAASIntegration.test_juju_bootstrap ... SKIP: Not testing juju
maas-integration.TestMAASIntegration.test_apply_tag_to_all_machines ... ok
maas-integration.TestMAASIntegration.test_check_tag_applied_to_all_machines ... ok
maas-integration.TestMAASIntegration.test_juju_deploy_postgresql ... SKIP: Not testing juju
maas-integration.TestMAASIntegration.test_juju_deploy_ubuntu_container ... SKIP: Not testing juju
maas-integration.TestMAASIntegration.test_allocate_machines ... ok
maas-integration.TestMAASIntegration.test_deploy_machine_with_centos ... SKIP: Not testing CentOS. Testing custom images repository.
maas-integration.TestMAASIntegration.test_deploy_machine_with_rhel ... SKIP: Not testing RHEL
maas-integration.TestMAASIntegration.test_deploy_machine_with_windows ... SKIP: Not testing Windows
maas-integration.TestMAASIntegration.test_deploy_machines ... ok
maas-integration.TestMAASIntegration.test_machines_deployed ... ok
maas-integration.TestMAASIntegration.test_ip_addresses_not_in_dynamic_range ... ok
maas-integration.TestMAASIntegration.test_ip_addresses_not_in_bmc_range ... ok
maas-integration.TestMAASIntegration.test_ssh_to_machines ... ok
maas-integration.TestMAASIntegration.test_enter_rescue_mode ... ok
maas-integration.TestMAASIntegration.test_exit_rescue_mode ... ok
maas-integration.TestMAASIntegration.test_release_machines ... ok
maas-integration.TestMAASIntegration.test_machines_released_and_ready ... ok

Deployed machine:

root@hip-dove:/home/ubuntu# dpkg -l | grep cloud-init
ii  cloud-init                            18.2-27-g6ef92c98-0ubuntu1~18.04.1 all          Init scripts for cloud instances
ii  cloud-initramfs-copymods              0.40ubuntu1                        all          copy initramfs modules into root filesystem for later use
ii  cloud-initramfs-dyn-netconf           0.40ubuntu1                        all          write a network interface file in /run for BOOTIF

cloud-init-output.log: http://paste.ubuntu.com/p/cV3FyWqqTX/