Do not load "qos-fip" if "qos" plugin is not loaded
Do not load "qos-fip" if "qos" plugin is not loaded

If QoS service plugin is not loaded, the L3 QoS extension in the OVN
L3 plugin should not be loaded neither.

Prior to this patch, the extension drivers were checked to find the
QoS extension. Although it is a misconfiguration to have the QoS
extension without loading the QoS driver, that is handled correctly
by the Neutron server, disabling the extension silently.

Closes-Bug: #1898842
Related-Bug: #1877408

Change-Id: Iea5ff76fe652ab1c04e23850b9259547c1d54365

openstack/neutron,mahak/neutron,mahak/neutron,openstack/neutron,mahak/neutron,openstack/neutron