workload evacuate

Registered by suzhengwei

If one compute node is marked as down, that may means the failure has already happened to the compute node. Then we need to evacuate the instances which are running on this node.

We need to do following things:
* add an action to evacuate all the instances of the failure compute node
* add a strategy which trgger the evacuate action

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
suzhengwei
Direction:
Needs approval
Assignee:
suzhengwei
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Alexander Chadin

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