Fall back to cn if gecos is not availablesssd-1.5.1-23.el6

We were not fully compliant with section 5.3 of RFC 2307 which
states:

   An account's GECOS field is preferably determined by a value of the
   gecos attribute. If no gecos attribute exists, the value of the cn
   attribute MUST be used. (The existence of the gecos attribute allows
   information embedded in the GECOS field, such as a user's telephone
   number, to be returned to the client without overloading the cn
   attribute. It also accommodates directories where the common name
   does not contain the user's full name.)

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