Ensure gates run the latest OVS

Change-Id: If4f98f4a611e852b9a280d14c7517df185518dfc

.zuul.d/base.yaml

@@ -36,6 +36,7 @@
       devstack_localrc:
         KURYR_K8S_API_PORT: 8080
         TEMPEST_PLUGINS: '/opt/stack/kuryr-tempest-plugin'
+        Q_BUILD_OVS_FROM_GIT: true
       devstack_services:
         # TODO(dmellado):Temporary workaround until proper fix
         base: false

.zuul.d/sdn.yaml

@@ -30,6 +30,8 @@
         Q_USE_PROVIDERNET_FOR_PUBLIC: true
         PHYSICAL_NETWORK: public
         OVN_L3_CREATE_PUBLIC_NETWORK: true
+        # OVN already builds from source by default
+        Q_BUILD_OVS_FROM_GIT: false
       devstack_services:
         ovn-northd: true
         ovn-controller: true