Enable support for dnstap

Packages describing “dnstap” as local USE flag

Package “dnstap” Flag Description
net-dns/dnsdist Enable support for dnstap
net-dns/knot Include support for the dnstap binary log format (http://dnstap.info/)
net-dns/nsd Enable the structured binary log format
net-dns/unbound Enable dnstap support
net-dns/bind Enables dnstap packet logging
net-dns/pdns-recursor Enable support for dnstap

All packages providing a “dnstap” USE flag (6)