largefiles: update lfutil.findoutgoing() discovery method It looks like this method missed the updates in 30273f0c776b (which changed the preferred discovery method from findcommonincoming() to findcommonoutgoing()), and cd956049fc14 (which rolls up the outgoing lists into a single object).

wireproto: fix pushkey hook failure and output on remote http repo Over http, a failed pushkey hook simply crashed the server, and successful hook output was never sent to the client.