The performance of quota usage sync in cinder driver should be enchanced

[Chaoyi Huang]

Currently the quota usage is sync-ed through list of all resources of these project and then sum. This handling's performance is not good, especially if multiple quota-usage task executed concurrently, will heavily impact the performance of Cinder for many queries in parallel

                volumes = self.cinder.volumes.list(search_opts=opts)
                snapshots = self.cinder.volume_snapshots.list(search_opts=opts)
                backups = self.cinder.backups.list(search_opts=opts)

                usages['gigabytes'] = sum([int(v.size) for v in volumes])
                usages['volumes'] = len(volumes)
                usages['snapshots'] = len(snapshots)
                usages['backups'] = len(backups)

After Cinder client support limit calling to get the usage directly, the code here should be improved.

[Chaoyi Huang (joehuang)]

Dimitri has address the query issue in Cinder, it's time to optimize the query in kingbird

https://review.openstack.org/#/c/314995/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/441952

[OpenStack Infra (hudson-openstack)]

Change abandoned by Goutham Pratapa (<email address hidden>) on branch: master
Review: https://review.openstack.org/441952