RPL-Lite: fix DAG lifetime, was 60h, now 8h
#ifdef RPL_CONF_DAG_LIFETIME
#define RPL_DAG_LIFETIME RPL_CONF_DAG_LIFETIME
#else
-#define RPL_DAG_LIFETIME (60 * 60) /* one hour */
+#define RPL_DAG_LIFETIME (8 * 60) /* 8 hours */
#endif /* RPL_CONF_DAG_LIFETIME */
/*
