<!--- Verify first that your feature was not already discussed on GitHub -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
<!--- Describe the new feature/improvement briefly below -->
dnf has a nobest [option](https://dnf.readthedocs.io/en/latest/command_ref.html#options-label) which does the following:

> --nobest
>     Set best option to False, so that transactions are not limited to best candidates only.

##### ISSUE TYPE
- Feature Idea

##### COMPONENT NAME
<!--- Write the short name of the module, plugin, task or feature below, use your best guess if unsure -->
dnf

##### ADDITIONAL INFORMATION
<!--- Describe how the feature would be used, why it is needed and what it would solve -->
Docker cannot be installed on CentOS8 without `--nobest` option and later on every time you want to do dnf upgrade you should pass `--nobest` option again, so that it does not complain about `docker-ce` package.
#
        
        #
        
        if self.exclude:
            _excludes = list(conf.exclude)
            _excludes.extend(self.exclude)
            conf.exclude = _excludes
        
        if self.disable_excludes:
            _disable_excludes = list(conf.disable_excludes)
            if self.disable_excludes not in _disable_excludes:
                _disable_excludes.append(self.disable_excludes)
                conf.disable_excludes = _disable_excludes
        
        if self.releasever is not None:
            conf.substitutions['releasever'] = self.releasever
        
        if self.skip_broken:
            conf.strict = 0
        if self.download_only:
            conf.downloadonly = True
            if self.download_dir:
                conf.destdir = self.download_dir
        
        conf.clean_requirements_on_remove = self.autoremove
        
        conf.install_weak_deps = self.install_weak_deps
    def _specify_repositories(self, base, disablerepo, enablerepo):