Our base CentOS qcow image version for x86_64 is 1809, which already
has the `authconfig` package preinstalled, unlike its aarch64
counterpart (version 1708), so enforce its installation.
The configuration files /etc/pam.d/*-auth-ac are required by the
ops-hardening task in infra-ansible.
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
Change-Id: I3a3ae3d97041adbeeee1a6573751a442ee63eff1