[NEW PORT] news/nzbhydra2: Usenet meta search

NZBHydra 2 is a meta search for NZB indexers. It provides easy access to a
number of raw and newznab based indexers. You can search all your indexers
from one place and use it as an indexer source for tools like Sonarr,
Radarr or CouchPotato.

WWW: https://github.com/theotherp/nzbhydra2

PR: 234537
Submitted by: Daniel Shafer <daniel shafer cc>
Differential_Revision: https://reviews.freebsd.org/D18704