Fix this by setting goproto_unrecognized_all=false which suppresses this field.
Upstream doesn't have the problem because they have pinned an older version
of gogo/protobuf: https://github.com/docker/libnetwork/pull/2242
Author: Felix Geyer <fgeyer@debian.org>
Gbp-Pq: Name libnetwork_proto_no_unrecognized_all.patch
option (gogoproto.gostring_all) = true;
option (gogoproto.sizer_all) = true;
option (gogoproto.goproto_stringer_all) = false;
+option (gogoproto.goproto_unrecognized_all) = false;
// EndpointRecord specifies all the endpoint specific information that
// needs to gossiped to nodes participating in the network.