This is copy/paste of flask.cli.main to instanciate our own group

def main(as_module=False):
    """This is copy/paste of flask.cli.main to instanciate our own group
    """
    this_module = __package__
    args = sys.argv[1:]

    if as_module:
        if sys.version_info >= (2, 7):
            name = 'python -m ' + this_module.rsplit('.', 1)[0]
        else:
            name = 'python -m ' + this_module

        # This module is always executed as "python -m flask.run" and as such
        # we need to ensure that we restore the actual command line so that
        # the reloader can properly operate.
        sys.argv = ['-m', this_module] + sys.argv[1:]
    else:
        name = None

    cli.main(args=args, prog_name=name)