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CA-404512: Add feature flag to the new clustering interface (#6217)
The new clustering interface uses a constructor `Extended` address when a cluster hots is trying to join a cluster. This causes problems during upgrades as a newly upgraded host might send out the new address format to old hosts, which do not understand this format, causing the new hosts not able to join. The fix would be to use the cluster_health feature flag/pool restrictions to gate the use of the new clustering interface. This makes sure that the new interface would only be used if all of the hosts understand this new interface, i.e. have this feature enabled. The cluster_health feature is controlled by v6d and is pool-wide, therefore the new interface would only be enabled if all v6ds are updated to the correct level, which also implies that the accompanying xapi are updated to the correct level.
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