dnstap-log-resolver-response-messages option has no effect unless
dnstap-log-resolver-query-messages option is also enabled.
The sample config from the dnstap website[1] works fine because it has
both of the mentioned options set, but if one wants to log resolver
responses only, the following config won't do:
dnstap:
dnstap-enable: yes
dnstap-log-resolver-response-messages: yes
[1] http://dnstap.info/Examples/
Index: dnstap/dnstap.c