Add API versioning to GENEVE tunnel implementation.

Change-Id: I5974e5545d74af53c27938c8cdbae12745c38a54
Signed-off-by: Marco Varlese <marco.varlese@suse.com>
diff --git a/src/vnet/geneve/geneve.api b/src/vnet/geneve/geneve.api
index eb39105..9be4bb3 100644
--- a/src/vnet/geneve/geneve.api
+++ b/src/vnet/geneve/geneve.api
@@ -13,7 +13,9 @@
  * limitations under the License.
  */
 
- define geneve_add_del_tunnel
+vl_api_version 1.0.0
+
+define geneve_add_del_tunnel
 {
   u32 client_index;
   u32 context;