Revised logic to handle SR replaying

* Added server_id into transaction in order to be able to stop
  streaming applier during high priority BF abort
* Added missing commit fragment applying
* Don't clear fragments for replaying SR transaction

include/wsrep/streaming_context.hpp

@@ -47,6 +47,7 @@ namespace wsrep
 
         void disable()
         {
+            wsrep::log_info() << "Disabling streaming";
             fragment_size_ = 0;
         }