Added the failure check logic for mq failover

Registered by kwonho lee

When MQ server is Active-Active mode, each Nova component's fanout queue exist each MQ server. When first MQ server is downed, then the fanout queues that exists in the first MQ server does not created in second MQ server.
So Added the check logic for existance of the fanout queue, and if the fanout queue does not exist, create it.

Blueprint information

Status:
Complete
Approver:
Russell Bryant
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
kwonho lee
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Russell Bryant

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This sounds like a bug fix, not a feature blueprint. --russellb

(?)

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