Add support for volume API v1 QoS commands
Add support for volume API v1 QoS commands

This commit adds the following commands:
  volume qos associate
  volume qos create
  volume qos delete
  volume qos disassociate
  volume qos list
  volume qos set
  volume qos show
  volume qos unset

Change-Id: I72ea1b9a4d0bd0e35eda03071ea438b75439fce9
Partial-Bug: #1467967

dtroyer/osc-lib