Use force-down API when host-failure recovery

Registered by takahara.kengo

In the recovery process of host-failure, masakari-engine sleeps for 3 minutes to wait for that the nova-compute service goes down.
But masakari-engine doesn't need to sleep because it can forcibly bring down the nova-compute service by using force-down API.
And by changing sleep to force-down API, masakari-engine can finish the host-failure recovery faster than before.

Blueprint information

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

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Gerrit topic: https://review.openstack.org/#/q/topic:bp/use-force-down-api

Addressed by: https://review.openstack.org/526015
    Use force-down API when host-failure recovery

Addressed by: https://review.openstack.org/526598
    Use force-down API when host-failure recovery

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