openflow_input: add BSN extensions to OF 1.4

I left out the following extensions that are no longer used or have been
superceded by the standard:

 - bsn_disable_split_horizon_check
 - bsn_role_status
 - bsn_global_vrf_allowed
diff --git a/openflow_input/bsn_controller_connections b/openflow_input/bsn_controller_connections
index eae315e..845d3b8 100644
--- a/openflow_input/bsn_controller_connections
+++ b/openflow_input/bsn_controller_connections
@@ -37,6 +37,7 @@
 // The URIs are of the form tcp://1.2.3.4:6553
 
 #version 4
+#version 5
 
 enum ofp_bsn_controller_connection_state(wire_type=uint8_t) {
     OFP_BSN_CONTROLLER_CONNECTION_STATE_DISCONNECTED = 0,