Node.orderBefore does not trigger (or triggers incomplete) cache events

There are 2 problems related to events coming from the cache when a Node.orderBefore operation is performed:

• if an orderBefore(node, null) is performed, the node is moved to the end of the children list, but no event is triggered at all (see JcrObservationManagerTest#shouldTestNodeReorderTest_testNodeReorderSameNameWithRemove)
• if there's a parent with 3 sns: node[1], node[2], node[3] and a orderBefore(node[3], node[2]) is performed, the path which is added to the event as information does not include SNS path (see JcrObservationManagerTest#shouldTestNodeReorderTest_testNodeReorderSameName )