MFC: r215259, r215272

• When printing media with more than one media option set aggregate these in a comma delimited list instead of repeating "mediaopt" for each one. This matches how the options of the active media are printed with print_media_word() and brings us in line what NetBSD does.
• When setting a media with no sub-type specified also reset the type specific options along with the global ones so these options don't stick when f.e. switching to IFM_AUTO.