
Port the models and db access code mostly from Cinder, for Cinder has implemented for hierarchy multi-tenancy quota management The quota management and control in Tricircle is described in the design doc: https://docs.google.com/document/d/18kZZ1snMOCD9IQvUKI5NVDzSASpw-QKj7l2zNqMEd3g/ BP: https://blueprints.launchpad.net/tricircle/+spec/implement-stateless Change-Id: I90d210f2154d8f68be49cc4fc4a62f2532cb5f92 Signed-off-by: Chaoyi Huang <joehuang@huawei.com>