Add a hockeypuck backend
Hockeypuck is a keyserver written in go, which has its own openpgp implementation.
https://github.com/hockeypuck/hockeypuck/tree/master/src/hockeypuck/openpgp
From the README:
openpgp
Package openpgp provides OpenPGP packet processing for keyservers. It is intended to support verification of signed key material and certifications.