Enhance scenario test to cover network dns_domain

Co-Authored-By: Slawek Kaplonski <skaplons@redhat.com>

Depends-On: I6120d504959631f084d63458f6e9dada0dc5cbdf
Depends-On: https://review.openstack.org/615556
Change-Id: Iaef52f9c43498c1748da14cd5ce72635bd31892d
2 files changed