Apparently 30s is a bit too long for some cases, see #5552. But not caching SERVFAIL at all also breaks stuff, see explanation in201d99584e. Let's try to find some middle ground, by lowering the cache timeout to 10s. This should be ample for the problem201d99584eattackes, but not as long as half a miute, as #5552 complains. Fixes: #5552
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