Registration is broken

[Jille]

I bet it's due to 2616a3a.

That commit changed the circles names to include port numbers, so we should now connect to :12000, but our certificates don't have that in the name yet. To fix that we'd have to create a new root CA :(

Failed to add circle: failed to connect to discovery server: context deadline exceeded: connection error: desc = "transport: authentication handshake failed: common_name mismatch (got \"rufs.domain\", want \"rufs.domain:12000\")"