dev-perl/Net-DNS: Bump to version 1.70.0

dev-perl/Net-DNS: Bump to version 1.70.0

- Add demo/ and contrib/ dir as USE=examples
- Add missing recommended deps

Upstream:
- Fix TSIG.pm
- Fix ::Async being unable to retry truncated UDP using TCP
- Fix hanging in recursive resolving
- Fix dying on scoped IPv6 nameserver addresses
- Fix case sensitive compression breaking resolver->nameservers
- Net::DNS::ZoneFile no longer fails when unnamed RR follows ORIGIN
- Fix compile with taint
- ::ZoneFile no longer fails parsing mixed case mnemonics
- ::Nameserver now supports EDNS replies

Package-Manager: Portage-2.3.3, Repoman-2.3.1