Return the routes for the interface

    CLI Example:

    .. code-block:: bash

        salt '*' ip.get_routes eth0

def get_routes(iface):
    '''
    Return the routes for the interface

    CLI Example:

    .. code-block:: bash

        salt '*' ip.get_routes eth0
    '''

    filename = os.path.join(_DEB_NETWORK_UP_DIR, 'route-{0}'.format(iface))
    results = _read_file(filename)

    filename = os.path.join(_DEB_NETWORK_DOWN_DIR, 'route-{0}'.format(iface))
    results += _read_file(filename)

    return results