Set nobody user and group

Upstream-Status: Inappropriate [configuration]

Signed-off-by: Roy.Li <rongqing.li@windriver.com>
--- a/idmapd.conf
+++ b/idmapd.conf
@@ -17,8 +17,8 @@
 
 [Mapping]
 
-#Nobody-User = nobody
-#Nobody-Group = nobody
+Nobody-User = nobody
+Nobody-Group = nogroup
 
 [Translation]