NetApp ONTAP 9.4 or newer supports Adaptive QoS, which scales the
throughput according to the volume size.
In Victoria release, ONTAP Cinder driver added support for assigning
pre-existing Adaptive QoS policy groups to volumes.
This patch allows the dynamic creation of Adpative QoS, by reading new
back-end QoS specs.
Implements: blueprint netapp-ontap-dynamic-adaptive-qos
Change-Id: Ie35373c7b205ffa12c4bb710255f1baf7a836d9f