ACL: add masteruser configuration for replication
In mostly production environment, normal user's behavior should be limited. Now in redis ACL mechanism we can do it like that: user default on +@all ~* -@dangerous nopass user admin on +@all ~* >someSeriousPassword Then the default normal user can not execute dangerous commands like FLUSHALL/KEYS. But some admin commands are in dangerous category too like PSYNC, and the configurations above will forbid replica from sync with master. Finally I think we could add a new configuration for replication, it is masteruser option, like this: masteruser admin masterauth someSeriousPassword Then replica will try AUTH admin someSeriousPassword and get privilege to execute PSYNC. If masteruser is NULL, replica would AUTH with only masterauth like before.
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