Scripting: add helper functions redis.error_reply() and redis.status_reply().
A previous commit introduced Redis.NIL. This commit adds similar helper
functions to return tables with a single field set to the specified
string so that instead of using 'return {err="My Error"}' it is possible
to use a more idiomatic form:
return redis.error_reply("My Error")
return redis.status_reply("OK")
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