add support for resolv.conf

[bvansomeren]

Hi Benno,

Thank you for your Ansible role to setup network connections for both Debian and Redhat, it's quite useful to me :) I've added a small addition to setup the resolv.conf for DNS.

Let me know if this is something you'd like to add. If you want I can also take care of the Ansible warnings in a separate PR.

Regards,

Barry