Validate that 'value' is a positive integer, which does not include 0.

def validate_positive_integer(option, value):
    """Validate that 'value' is a positive integer, which does not include 0.
    """
    val = validate_integer(option, value)
    if val <= 0:
        raise ValueError("The value of %s must be "
                         "a positive integer" % (option,))
    return val