babeld: babelz merge.

Babelz is the last version of the stand-alone babel daemon. In
particular, it use multiple channels to diminuate
interferences. Please refer to this one for more details.
diff --git a/babeld/babeld.c b/babeld/babeld.c
index 0cf8c8a..d69662c 100644
--- a/babeld/babeld.c
+++ b/babeld/babeld.c
@@ -269,7 +269,7 @@
 static void
 babel_clean_routing_process()
 {
-    babel_uninstall_all_routes();
+    flush_all_routes();
     babel_interface_close_all();
 
     /* cancel threads */