cli = (argv, command, callback) => {
            newmanCLI(argv, (err) => {
                callback(err, _.get(newman, [command, 'lastCall', 'returnValue']));
            });
        }
Wrap newmanCLI callback to extract options passed to sinon `newman` stub.

@param {String[]} argv - Argument vector.
@param {String} command - Newman command name, used for `sinon` result lookup.
@param {Function} callback - The callback function invoked on the completion of commander parsing.