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replicaset: implement `bootstrap` / `rebootstrap` commands
Implement bootstrap / rebootstrap commands.
Was decided to implement:
tt rs vshard bootstrap - bootstraps vshard in cartridge/3.0 cluster.
tt rs bootstrap - bootstraps an instance in cartridge/3.0 replicaset (by the fact, new instance joins to the replicaset).
tt rs reboostrap - restarts an instance in the replicaset trying to save uuid, if it could be done.