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This fixes a scenario when control plane node loses contents of `/var` without leaving etcd first: on reboot etcd data directory is empty, but member is already present in the etcd member list, so etcd won't be able to join because of raft log being empty. The fix is to remove a member with matching hostname if found in the etcd member list followed by new member add. The risk here is removing another member which has same hostname as the joining node, but having duplicate hostnames for control plane node is a problem anyways. Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>