testing with openstack-nova-network-13.1.2-9.el7ost.noarch for OSP 9 it does not install conntrack-tools Looking at current .spec file there is a changelog entry for it but no Requires on conntrack-tools listed
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2017-0467.html