canonicalizeName and its wrapper functions in in mongo_gssapi.cpp accept a std::string* as an out-parameter which they populate with a canonical name. These functions return a Status to indicate whether canonicalization was successful. Out-parameters aren't preferred in our codebase, because they aren't clear. Instead, we should modify the functions to return StatusWith<std::string>, which represents either a std::string, or a Status object containing an error. This style is more clear as to the intent of the returned string, and is assumed to have equivalent performance.