This fully implements all expected functionality of the dnf module.
Group removal may behave oddly due to hiccups in tagging groups as being
installed.
A pkg_types option could be added to specify the group package types.
disable_gpg_check was configured backwards, so it was toggled. Typos in
enablerepo/disablerepo are removed. fill_sack() calls are relocated to
occur after repo decisions. The "changed" key is now set for new
installations.
- Backport config file handling from the DNF module rewrite #527
(Current config handling does not work with dnf and leads to
tracebacks when run as an unprivileged user).
- Make a mandatory requirement on yum-utils (for /usr/bin/repoquery)
because none of the fallback code works for dnf (it's unported yum API
code).
Both of these issues will be fixed better in the dnf rewrite when it is
feature complete.
Fixes#471
