hrs 123cf5c769 MFC r279538:
Fix group membership of cloned interfaces when one is moved by
if_vmove().

In if_vmove(), if_detach_internal() and if_attach_internal() were
called in series to detach and reattach the interface.  When
detaching, if_delgroup() was called and the interface leaves all of
the group membership.  And then upon attachment, if_addgroup(ifp,
IFG_ALL) was called and it joined only "all" group again.

This had a problem. Normally, a cloned interface automatically joins
a group whose name is ifc_name of the cloner in addition to "all"
upon creation.  However, if_vmove() removed the membership and did
not restore upon attachment.

Approved by:	re (gjb)
2015-07-23 19:57:47 +00:00
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