m/n/c/curator: add UpdateStatus

This implements Curator.UpdateStatus, which lets nodes self-report some
status items. Currently this is their external IP address, which is
needed to generate a Cluster Directory which is in turn needed to
register into a cluster.

Change-Id: Ib5464ca78ee3466d9b9f89b7af8b40f613ae8dcc
Reviewed-on: https://review.monogon.dev/c/monogon/+/332
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/proto/api/management.proto b/metropolis/proto/api/management.proto
index ae7dd8d..bbd81f8 100644
--- a/metropolis/proto/api/management.proto
+++ b/metropolis/proto/api/management.proto
@@ -25,4 +25,4 @@
 message GetRegisterTicketResponse {
     // Opaque bytes that comprise the RegisterTicket.
     bytes ticket = 1;
-}
\ No newline at end of file
+}