Description of quota configuration options

Configuration option = Default value	Description
[DEFAULT]
max_accepted_volume_size = 5	(IntOpt) Default maximum volume size (in GB) for an instance.
max_backups_per_user = 50	(IntOpt) Default maximum number of backups created by a tenant.
max_instances_per_user = 5	(IntOpt) Default maximum number of instances per tenant.
max_volumes_per_user = 20	(IntOpt) Default maximum volume capacity (in GB) spanning across all Trove volumes per tenant.
quota_driver = trove.quota.quota.DbQuotaDriver	(StrOpt) Default driver to use for quota checks.