MFC r272889 and r287402:
- Virtualize if_epair(4). An if_xname check for both "a" and "b" interfaces
is added to return EEXIST when only "b" interface exists---this can happen
when epair<N>b is moved to a vnet jail and then "ifconfig epair<N> create"
is invoked there.
- Fix a panic which was reproducible by an infinite loop of
"ifconfig epair0 create && ifconfig epair0a destroy".
This was caused by an uninitialized function pointer in
softc->media.
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