Keeping the 1:1 relationship between OVN and OpenStack, we will need OVS 2.10 for OSP 14: upstream OVN 2.10 packaged in OVS 2.10 is developed in tandem with OpenStack Rocky, both are supposed to release within a 2 week delay.
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://access.redhat.com/errata/RHEA-2019:0045