sleep to let link_detected then user register then link_up occur

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4791 818b1a75-f10b-46b9-bf7c-635c3b92a50f

targets/SIMU/USER/oaisim_functions.c

@@ -720,6 +720,7 @@ void init_802_21_link_saps() {
           exit (-1);
       }
   }
+  sleep(15);
 #endif
 #endif
 #endif