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Currently consensus has a bootstrap routine where a tsnet node tries to join each other node with the cluster tag, and if it is not able to join any other node it starts its own cluster. That algorithm is racy, and can result in split brain (more than one leader/cluster) if all the nodes for a cluster are started at the same time. Add a FollowOnly argument to the bootstrap function. If provided this tsnet node will never lead, it will try (and retry with exponential back off) to follow any node it can contact. Add a --follow-only flag to cmd/natc that uses this new tsconsensus functionality. Also slightly reorganize some arguments into opts structs. Updates #14667 Signed-off-by: Fran Bull <fran@tailscale.com>