yum: do not use unsupported parameter warn

[tschoonj]

The latest Ansible release appears to stop when encountering unsupported parameters.

    vagrant: TASK [PeterMosmans.virtualbox-guest : Install latest kernel and headers for CentOSes] ***
    vagrant: fatal: [default]: FAILED! => {"changed": false, "msg": "Unsupported parameters for (dnf) module: warn Supported parameters include: allow_downgrade, autoremove, bugfix, conf_file, disable_excludes, disable_gpg_check, disable_plugin, disablerepo, download_dir, download_only, enable_plugin, enablerepo, exclude, install_repoquery, install_weak_deps, installroot, list, lock_timeout, name, releasever, security, skip_broken, state, update_cache, update_only, validate_certs"}
    vagrant:

[PeterMosmans]

Thanks @tschoonj , much appreciated.

[tschoonj]

You're most welcome!

Will you be making a new release with this fix soon?

[PeterMosmans]

Yeah, I'll bump the version number later today, so it will automatically be picked up by Galaxy.

[tschoonj]

Excellent! Thanks!