All relatively modern cloud-inits are capable of creating default user
as well as granting root privileges for them. Currently
cloud-init creates pretty much the same sudoers file.
So running steps under the new DIB_DEBIAN_CLOUD_INIT_HELPER
does not make sense for last couple of Debian releases.
Change-Id: I3cebd318f1f0313bba00ecf639328978d3ad0f32
