Separate quota_classes client from quotas client

Each resource should be implemented in each separated module.
quota_classes and quotas are different resources like
  os-quota-class-sets
  os-quota-sets
So this patch separates quota_classes client from quotas client.

Partially implements blueprint consistent-service-method-names

Change-Id: Icd98294c7a161f5c8c1d7202df9f3e6d9daee1d9
4 files changed