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Fixes #3714 This provides more safe way to join new members to the etcd cluster. See https://etcd.io/docs/v3.4/learning/design-learner/ With learner mode join there are few differences: * new nodes are joined one by one, because etcd enforces a single learner member in the cluster * learner members are not counted in quorum calculations, so while learner catches up with the master node, quorum is not affected and cluster is still operational Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>