Add Red Hat styled service configuration

[ixs]

Allow listening_interfaces on Red Hat family systems as well. As these are by now using systemd, a systemd override file is installed in /etc/systemd/system/dhcpd.service.d/override.conf defining the interface list.

[myii]

@ixs We've switched a number of our formulas to use semantic-release now, so the commit messages are used to automatically update the changelog and add a new release. Have a look here for more details:

• https://github.com/saltstack-formulas/.github/blob/master/CONTRIBUTING.rst#commit-message-formatting

So as shown in Travis, commitlint is failing:

• https://travis-ci.com/saltstack-formulas/dhcpd-formula/jobs/291745577#L320-L330

This could be resolved with something like:

-Add Red Hat styled service configuration
+feat(map.jinja): add Red Hat styled service configuration

• Note the use of lowercase above.
• The commit body itself is fine.

Would you be able to amend your commit message and then force push back to this branch?

[ixs]

@myii done.

[myii]

Thanks, @ixs -- merged.

The opensuse-leap failure is unrelated to this PR.

[saltstack-formulas-travis]

:tada: This PR is included in version 0.10.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: