Section 13. Whoever commits manslaughter shall, except as hereinafter provided, be punished by imprisonment in the state prison for not more than twenty years or by a fine of not more than one thousand dollars and imprisonment in jail or a house of correction for not more than two and one half years. Whoever commits manslaughter while violating the provisions of sections one hundred and one to one hundred and two B, inclusive, of chapter two hundred and sixty-six shall be imprisoned in the state prison for life or for any term of years.