How to get an empty file /etc/resolv.conf ?

When creating a virtual machine, entries like "search openstacklocal" or "domain openstacklocal" always appear in the /etc/resolv.conf file. I want that after creating any virtual machine in the file /file the lines “search openstacklocal” or “domain openstacklocal” were missing. I found a way to change these lines, but my goal is completely missing them. How can this be implemented? Which function needs to be fixed and where? I use Openstack train