The QoS OVN client extension is moved to the ML2 driver. This
extension is called from the OVN driver in the events of:
- create port
- update port
- delete port
- update network
The QoS OVN client extension now can accept several rules per policy
as documented in the SUPPORTED_RULES. The QoS OVN client extension
can write one OVN QoS rule per flow direction and each OVN QoS rule
register can hold both a bandwidth limit rule and a DSCP marking rule.
The "update_policy" method is called from the OVN QoS driver, when
a QoS policy or its rules are updated.
The QoS OVN client extension updates the QoS OVN registers
exclusively, based on the related events.
Closes-Bug: #1863852
Change-Id: I4833ed0c9a2741bdd007d4ebb3e8c1cb4c30d4c7
b098239d72