raft: Allow multiple addresses on raft cluster Join
@abronan is already working on this.
Since Apr 15, 2016.
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Description
Stumbled upon this during my investigation of Jepsen, but a nice improvement (for the bootstrapping part) would be to define multiple addresses on raft Join so that if the first address fails, we try on the second, third, etc. It is especially useful for tests using the command line as an entrypoint and simulating failures (like Jepsen).
Related to #253 and #291
Only complex part is to make sure that the operation is idempotent on every node; if multiple joins are sent because the first join was lost, we should end up in the same state. Which should already be the case.
Also not sure how it's going to look like after the CA stuff is included.
/cc @aaronlehmann @diogomonica
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