subnet module deletes global cache and cachedb cache when it
stores a result, and serve-expired is enabled, so that the global
reply, that is older than the ecs reply, does not return after
the ecs reply expires.
that uses a Redis server as the storage. This implementation
depends on the hiredis client library (https://redislabs.com/lp/hiredis/).
And unbound should be built with both --enable-cachedb and
--with-libhiredis[=PATH] (where $PATH/include/hiredis/hiredis.h
should exist). Patch from Jinmei Tatuya (Infoblox).
git-svn-id: file:///svn/unbound/trunk@4586 be551aaa-1e26-0410-a405-d3ace91eadb9
