fix: translate TCP errors

fixes #129

Author: rahulreddy

lib/IAMClient.js

@@ -423,9 +423,8 @@ class IAMClient {
                     method: 'IAMClient:request()',
                     error: err.stack || err,
                 });
-                return callback(errors.InternalError);
             }
-            return callback(err);
+            return callback(errors.InternalError);
         });
         req.end();
     }