Adds the clients and tests for CINDER QoS V1 & V2 APIs

This patch adds the JSON clients and tests for following
CINDER QoS-specs V1 & V2 APIs :

1. qos-create
2. qos-delete
3. qos-list
4. qos-get
5. qos-key
6. qos-associate
7. qos-get-association
8. qos-disassociate
9. qos-disassociate-all

Partially Implements blueprint: client-checks-success
Partially Implements blueprint: cinder-v2-api-tests

Co-authored-by: Abhijeet.Jain <abhijeet.jain@nectechnologies.in>

Change-Id: I7fc424b57e4e8decf61e991b2988e1cead5dda9b