exp/upbox: remove 'generating key' log messages

Change-Id: I0ea68ca2d16cf480cff3fb2cd8d47b1d30a93d88
Reviewed-on: https://upspin-review.googlesource.com/10070
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/upbox/schema.go b/upbox/schema.go
index fd22581..f6b1961 100644
--- a/upbox/schema.go
+++ b/upbox/schema.go
@@ -376,7 +376,6 @@
 		return err
 	}
 	for _, u := range sc.Users {
-		fmt.Fprintf(os.Stderr, "upbox: generating keys for user %q\n", u.Name)
 		dir := filepath.Join(sc.dir, u.Name)
 		if err := os.MkdirAll(dir, 0700); err != nil {
 			return err