function doUntil(fn, test, callback) {
    doWhilst(fn, function () {
        return !test.apply(this, arguments);
    }, callback);
}
Like ['doWhilst']{@link module:ControlFlow.doWhilst}, except the `test` is inverted. Note the
argument ordering differs from `until`.

@name doUntil
@static
@memberOf module:ControlFlow
@method
@see [async.doWhilst]{@link module:ControlFlow.doWhilst}
@category Control Flow
@param {Function} fn - A function which is called each time `test` fails.
The function is passed a `callback(err)`, which must be called once it has
completed with an optional `err` argument. Invoked with (callback).
@param {Function} test - synchronous truth test to perform after each
execution of `fn`. Invoked with the non-error callback results of `fn`.
@param {Function} [callback] - A callback which is called after the test
function has passed and repeated execution of `fn` has stopped. `callback`
will be passed an error and any arguments passed to the final `fn`'s
callback. Invoked with (err, [results]);