This commit is similar to . The OVN QoS extension does not manage
the external type ports (SR-IOV); the port QoS policy of those ports
is handled by the SR-IOV agent QoS extension.
When a network is updated, the OVN QoS extension should check the type
of port bound. In case of having an "external" port (SR-IOV), the QoS
extension should not handle it.