All commitments upon process issued in criminal cases by the supreme court, the superior court within and for the counties of Providence and Newport, and the district court for the second and sixth divisions shall be made by deputy sheriffs attending upon the courts respectively, and all writs of habeas corpus issued by the supreme court, the superior court within and for the counties of Providence and Newport, and the district court for the second and sixth divisions shall be served by deputy sheriffs attending upon the courts respectively, and the deputy sheriffs shall receive no fees for making the commitments or for serving the writs, but shall receive their actual expenses of travel, to be allowed by the court, and which shall not form a part of the bill of costs taxed against a convict under § 12-20-9.