Disaster recovery

Disaster recover for zero and alpha.
If raft crash more than half of voters, and docker can’t not available, it can be usefully for online environment.

Just restart the only alive node of zero or alpha with --force_new_cluster=true, the cluster will good.
But this method is lossy recovery, you must use this when you have not other method, it’s the last resort when you are in disaster.

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@dmai @ibrahim @mrjn @joaquin can we schedule some time to merge this PR? This is a brand new feature that looks to be very useful.

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