Factor out DDB commands from r204145, r204279 into if_debug.c for further enhancements (1). Switch to a standard 2-clause BSD license for this (2).
Unfortunately we have to un-static the ifindex_table for this but do not publicly export it.
Suggested by: rwatson (1) a while back. Approved by: thompsa (2) for the change from r204279. MFC after: 6 days
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