[syslog-ng] NXDomain dns caching

[brian hoffman]

 I was looking at our DNS traffic on the syslog boxes and it seemed to be more than I would expect. I bumped up the dns_cache value which definitely helped, and now the vast majority of queries seem to return NXDomain.  So my question is, does syslog-ng not have a negative DNS cache?  The version that I tested this on was syslog-ng-3.37.1-1.el7 on RHEL7.
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