Comment 3 for bug 1987378

Just to be sure we discussed this during the drivers meeting (see [1]), and agreed that this is an obvious extension of current DSCP QoS code, and we don't need a new API extension as QoS rule types API is available to fetch the available DSCP codes for example (see [2]). Note: The api-ref should be updated to have suche example in it.

[1]: https://meetings.opendev.org/meetings/neutron_drivers/2022/neutron_drivers.2022-08-26-14.00.log.html#l-19
[2]: https://docs.openstack.org/api-ref/network/v2/index.html#qos-rule-types