Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Add the support for 802.1q and port based vlans for arswitch.Tested on: RB450G (standalone ar8316), RSPRO (standalone ar8316) andTPLink MR-3220 (ar724x integrated switch).Approved by: adrian (mentor)Obtained from: zrouter