add support to cluster-lock/cluster-unlock

Registered by miaohb

The idea is borrowed from HA clustering about maintenance mode, in which the engine will not manage the members anymore.

Blueprint information

Status:
Not started
Approver:
Qiming Teng
Priority:
Medium
Drafter:
miaohb
Direction:
Approved
Assignee:
miaohb
Definition:
Discussion
Series goal:
Accepted for pike
Implementation:
Unknown
Milestone target:
None

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Sprints

Whiteboard

Need some description about how this is gonna be supported.

[20170302 XueFeng]
Discussed with hb, here add a etherpad to discuss.
https://etherpad.openstack.org/p/senlin-cluster-lock-unlok

(?)

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