gb/vty: Fix the VTY node string for L_NS_NODE

Use 'config-ns' instead of plain 'ns' and append a blank after the
'#' to make the vty python test script work.

Sponsored-by: On-Waves ehf

src/gb/gprs_ns_vty.c

@@ -71,7 +71,7 @@ static void log_set_nsvc_filter(struct log_target *target,
 
 static struct cmd_node ns_node = {
 	L_NS_NODE,
-	"%s(ns)#",
+	"%s(config-ns)# ",
 	1,
 };