(plaintiff, Michigan winery, challenged Arizona statutes regulating direct shipment of wine from wineries as violating the dormant Commerce Clause by discriminating against out-of-state wineries; court disagreed, finding that existing exemptions to three-tier distribution system under certain circumstances which result in treating similarly situated in-state and out-of-state wineries the same and do not impose new impermissible burdens on out-of-state wineries and do not have the practical effect of favoring in state economic interests over out-of-state interests).