Function to generate a random CIDR value
    :param 
        lowest_mask: An integer value for the lowest mask you want it to generate
    
    :return: 
        A string of a random CIDR mask

def random_cidr_mask(lowest_mask=16):
    """
    Function to generate a random CIDR value
    :param 
        lowest_mask: An integer value for the lowest mask you want it to generate
    
    :return: 
        A string of a random CIDR mask
        
    """
    if lowest_mask < 33:
        return str(__random.randrange(lowest_mask, 33))

    else:
        LOGGER.critical('{lowest_mask} must be 32 or less.'.format(lowest_mask=lowest_mask))
        raise ValueError('{lowest_mask} must be 32 or less.'.format(lowest_mask=lowest_mask))