Sentinel: Redis-side support for slave priority.
A Redis slave can now be configured with a priority, that is an integer number that is shown in INFO output and can be get and set using the redis.conf file or the CONFIG GET/SET command. This field is used by Sentinel during slave election. A slave with lower priority is preferred. A slave with priority zero is never elected (and is considered to be impossible to elect even if it is the only slave available). A next commit will add support in the Sentinel side as well.
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