support disable_terminate for instance

Registered by lvdongbing

With 'disable_terminate' option, we can protect instance from being accidentally terminated,
but now, nova dosen't support to it.

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Status:
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None
Priority:
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Drafter:
lvdongbing
Direction:
Needs approval
Assignee:
lvdongbing
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
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