removed OVN flag from ci-builder env

Author: g0rgamesh

etc/kayobe/environments/ci-builder/stackhpc-ci.yml

@@ -23,7 +23,6 @@ kolla_enable_mariabackup: true
 kolla_enable_neutron_sriov: true
 kolla_enable_octavia: true
 kolla_enable_opensearch: true
-kolla_enable_ovn: true
 kolla_enable_prometheus: true
 kolla_enable_redis: true
 kolla_enable_skydive: true