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RE: (ITS#4388) Problem with user group names containing commas

Actually, on re-reading RFC 2253, that is not correct and it should not
really be using this form of escaping in this case. From RFC 2253
section 2.4:

   If a character to be escaped is one of the list shown above, then it
   is prefixed by a backslash ('\' ASCII 92).

   Otherwise the character to be escaped is replaced by a backslash and
   two hex digits, which form a single byte in the code of the

The comma character is in that list, and so being pedantic it should
simply be prefixed by a '\'.