closes #5685, dirty the rollback log node when we give it to a transaction...

closes #5685, dirty the rollback log node when we give it to a transaction after rollback_log_node_cache.get_rollback_log_node

git-svn-id: file:///svn/toku/tokudb@49961 c7de825b-a66e-492c-adef-691d508d4ae1

ft/rollback.cc

@@ -111,7 +111,7 @@ static void rollback_initialize_for_txn(
     log->newest_logentry = NULL;
     log->rollentry_arena = memarena_create();
     log->rollentry_resident_bytecount = 0;
-
+    log->dirty = true;
 }
 
 void make_rollback_log_empty(ROLLBACK_LOG_NODE log) {