Add dependency on centos-release-nfv-openvswitch
We planning to consume ovs/ovn builds from NFV SIG and
backport rdo-openvswitch related change[1] to ussuri and
for that we want nfv-openvswitch repos to be included, this
patch does that.
[1] https://review.rdoproject.org/r/#/c/29009/