* Fixed: Initialized session-id to 1 instead of 0 following ietf-netconf.yang

* Clearer debug levels `clicon_debug()`:
  1: Logical debug message
  2: Input and output packets
  3: Message dump in hex, xpath parse trees

apps/backend/backend_main.c

@@ -1053,7 +1053,7 @@ main(int    argc,
         goto done;
 
     /* Start session-id for clients */
-    clicon_session_id_set(h, 0);
+    clicon_session_id_set(h, 1);
 #if 0 /* debug */
     /* Enable this to get prints of datastore and session status */
     if (0 && clicon_debug_get() &&