Get quota and usage from neutron for limit APIs

Registered by Cale Rath

On a system configured to use Neutron, for limit API, we should retrieve
quota and usage for floating IPs and security groups from Neutron,
rather than Nova DB.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Cale Rath
Direction:
Needs approval
Assignee:
Cale Rath
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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