Use a different method to disable multiversion installation
    
    Per the recommendations of the DNF team, switch from setting
    installonly_limit to setting installonlypkgs to effectively disable
    the multiversion installation behavior.
    
    This is done because setting installonly_limit to 1 does not
    actually do anything, whereas overriding the installonlypkgs
    configuration to indicate no packages are handled through this
    mechanism effectively disables the beahvior.
    
    Once again, we need to raise the minimum libdnf version to make
    this work.