ensure-dirs: Don't hardcode ssconf file group

Otherwise chown(2) will fail when noded doesn't run as root.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

lib/tools/ensure_dirs.py

@@ -149,7 +149,7 @@ def GetPaths():
   ss = ssconf.SimpleStore()
   for ss_path in ss.GetFileList():
     paths.append((ss_path, FILE, constants.SS_FILE_PERMS,
-                  getent.noded_uid, 0, False))
+                  getent.noded_uid, getent.noded_gid, False))
 
   paths.extend([
     (pathutils.QUEUE_DIR, DIR, 0700, getent.masterd_uid,