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update default values for raft protocol #158

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update default values for raft protocol #158

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dotdiego
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Pull request for issue #157

@Rendanic
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Automatic change of nomad_raft_protocol during upgrade of nomad_version could crash the cluster.
The change require different upgrade steps - depending on Cluster with 1 or 3+ servers - before the server is started with new protocal version.
Single-Node won't start after changing the protocol version and you can't go back to previous version.

https://www.nomadproject.io/docs/upgrade#upgrading-to-raft-protocol-3

@IamTheFij
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This could be mitigated by at least specifying the default for 1.4 to be protocol 3 as it's broken with protocol 2 anyway.

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@dotdiego @Rendanic @IamTheFij