YUM4/DNF compatibility via yum action plugin (#44322)

* YUM4/DNF compatibility via yum action plugin

DNF does not natively support allow_downgrade as an option, instead
that is always the default (not configurable by the administrator)
so it had to be implemented

 - Fixed group actions in check mode to report correct changed state
 - Better error handling for depsolve and transaction errors in DNF
 - Fixed group action idempotent transactions
 - Add use_backend to yum module/action plugin
 - Fix dnf handling of autoremove (didn't used to work nor had a
   default value specified, now does work and matches default
   behavior of yum)
 - Enable installroot tests for yum4(dnf) integration testing, dnf
   backend now supports that
 - Switch from zip to bc for certain package install/remove test
   cases in yum integration tests. The dnf depsolver downgrades
   python when you uninstall zip which alters the test environment
   and we have no control over that.
 - Add changelog fragment
 - Return a pkg_mgr fact if it was not previously set.

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