7d5ddd30cd
virtual ifnets more realistically mimic physical ethernet interfaces. The main motivation behind this change is to allow for ng_eiface(4) interfaces to participate in STP if_bridge(4) configurations. When announcing link status changes, switch to the vnet to which the ifnet belongs, since it is possible for ng_eiface ifnets to be assigned to a vnet different from the one in which its netgraph node resides. MFC after: 3 days