dnf: name=PACKAGE state=latest is reponsible for two use cases:
- to install a package if not already installed.
- to update the package to the latest if already installed.
The latter use cases is not handled properly as base.upgrade does not
throw dnf.exceptions.MarkingError if a package is not installed.
Setting base.conf.best = True ensures a package is installed or
updated to the latest when calling base.install.
Sign-off: jsilhan@redhat.com
Sign-off: jchaloup@redhat.com