Implement an endpoint to successfully reply to unauthenticated health requests

Registered by Fabrizio Vanni

The HAProxy sends unauthenticated requests to the
api service to check its availability.

Since this polling is very frequent, the reply should be
as fast as possible and involve the least possible number
of resources.
A possible solution would be to have the most external WSGI app
to reply immediately.

Blueprint information

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

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Gerrit topic: https://review.openstack.org/#q,topic:bp/haproxy-endpoint,n,z

Addressed by: https://review.openstack.org/207405
    add api endpoint /v1/health to support HAProxy

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