Get servers filtered by host status

Registered by Tomi Juvonen

Now that host_status can be gotten trough servers/detail one also need to be able to get instances filtered by host_status value. This will have the admin (or owner if policy configured for owner) the ability to query instances by host status to plan actions accordingly.

Blueprint information

Status:
Started
Approver:
None
Priority:
Undefined
Drafter:
Tomi Juvonen
Direction:
Needs approval
Assignee:
Tomi Juvonen
Definition:
New
Series goal:
None
Implementation:
Started
Milestone target:
None
Started by
Tomi Juvonen

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Gerrit topic: https://review.openstack.org/#q,topic:bp/servers-by-host-status,n,z

Addressed by: https://review.openstack.org/276671
    Get servers filtered by host status

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