Robert Greenwalt 9363d91218 Add per-interface dns caches.
import of changes 22100 and 23138 from opensource.

Change-Id: I3ce86394323d269272aeb2bebeed4374f171a8cf
2011-07-26 12:59:50 -07:00
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2011-07-26 12:59:50 -07:00