[new] net/knot-resolver - recursive caching resolver

Hi,
I've attached a port for the knot-resolver.

Knot Resolver is a modern resolver implementation designed for
scalability, resiliency, and flexibility. Its design is different
from other resolvers: The core architecture is tiny and efficient,
and most of the rich features are implemented as optional modules,
which limits attack surface and improves performance.

There's a user and group created for this, along with a rc.d service file. The default service listens on localhost and is able to answer queries for me.


OK to import?

Best,
Aisha

diff --git a/infrastructure/db/user.list b/infrastructure/db/user.list
index 077d520e641..695da97f00b 100644
--- a/infrastructure/db/user.list
+++ b/infrastructure/db/user.list
@@ -30,7 +30,7 @@ id user group port
519 _news _news news/leafnode
520 _majordomo _majordomo mail/majordomo
521 _exim _exim mail/exim
-#522 _xcept _xcept comms/xcept
+522 _knot-resolver _knot-resolver net/knot-resolver
523 _ffproxy _ffproxy www/ffproxy
#524 _mail mail/openwebmail
525 _quagga _quagga net/quagga