Implement event listeners of the FlowManager.

- This commit adds two types of event objects: FlowBatchStateChangedEvent and FlowStatesChangedEvent.
- Listeners for these objects are defined by FlowManagerListener interface.
- FlowBatchStateChangedEvent notifies state changes of the flow batch operation.
 -- The state is defined by FlowBatchState.
- FlowStatesChangedEvent notifies state changes of the set of Flow objects.
 -- The state is defined by FlowState.
- This task is a part of ONOS-1739.

Change-Id: Ie8b3bb1c58dbe6bc608936e4a269e1de12dee96c
diff --git a/src/main/java/net/onrc/onos/api/flowmanager/FlowBatchId.java b/src/main/java/net/onrc/onos/api/flowmanager/FlowBatchId.java
new file mode 100644
index 0000000..9899adf
--- /dev/null
+++ b/src/main/java/net/onrc/onos/api/flowmanager/FlowBatchId.java
@@ -0,0 +1,8 @@
+package net.onrc.onos.api.flowmanager;
+
+/**
+ * Represents ID for {@link FlowBatchOperation}.
+ */
+public class FlowBatchId {
+    // TODO implement it
+}