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failover: prefer instances with more recent txns as masters #5645

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Since: 3.7

Document: Supervised failover
Subsection: Appointing a new master instance

The Tarantool Failover Coordinator appoints the most appropriate
instance as a new master taking into account priorities configured by
the failover.replicasets.*.priority option and information on
instances vclocks (see box.info.vclock).
Requested by @georgiy-belyanin in https://github.com/tarantool/tarantool-ee/commit/a30307c75e7c2f18da1f453b64ec5889481ae65e.

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