Trim trailing spaces in error replies coming from rejectCommand (#7668)
65a3307b added rejectCommand which takes an robj reply and passes it through addReplyErrorSafe to addReplyErrorLength. The robj contains newline at it's end, but addReplyErrorSafe converts it to spaces, and passes it to addReplyErrorLength which adds the protocol newlines. The result was that most error replies (like OOM) had extra two trailing spaces in them. (cherry picked from commit cdd925b2)
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