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Remove redundant CREATEUSER/NOCREATEUSER options in CREATE ROLE et al.
Once upon a time we did not have a separate CREATEROLE privilege, andCREATEUSER effectively meant SUPERUSER. When we invented CREATEROLE(in 8.1) we also added SUPERUSER so as to have a less confusing keywordfor this role property. However, we left CREATEUSER in place as adeprecated synonym for SUPERUSER, because of backwards-compatibilityconcerns. It's still there and is still confusing people, as for examplein bug #13694 from Justin Catterson. 9.6 will be ten years or so later,which surely ought to be long enough to end the deprecation and justremove these old keywords. Hence, do so.