ovs: improve log message when ofport is not configured

This switch the warning to error as we may be in a sitation of no
connectivity and this should never happen.

Also improves the condition for an ofport invalid.

Signed-off-by: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@industrialdiscipline.com>
Change-Id: Ic6bd7bfadcba8deb132d8af3e295ec25a8d64b50

neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py

@@ -1848,10 +1848,10 @@ def treat_vif_port(self, vif_port, port_id, network_id, network_type,
         # for being treated. If that does not happen, it is a potential
         # error condition of which operators should be aware
         port_needs_binding = True
-        if not vif_port.ofport:
-            LOG.warning("VIF port: %s has no ofport configured, "
-                        "and might not be able to transmit",
-                        vif_port.vif_id)
+        if not vif_port.ofport or vif_port.ofport == ovs_lib.INVALID_OFPORT:
+            LOG.error("VIF port: %s has no ofport configured or is invalid, "
+                      "and might not be able to transmit. (ofport=%s)",
+                      vif_port.vif_id, vif_port.ofport)
         if vif_port:
             if admin_state_up:
                 port_needs_binding = self.port_bound(