Enable QueryCache by default #786
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The query cache should be enabled by default. This will help with determining proper timeouts for #736. It can still be disabled by setting the ttl to 0. There should be no negative consequences of this in real-world scenarios since DNS is based on the TTL concept and upstream servers will cache results and not recurse based on this information anyhow. DNS queries and responses are very small, this should have negligible impact on memory consumption.
Fix By: Brad House (@bradh352)