Define ID representation for Intent, IFlow and MatchAction

- Defines BatchOperationTargetId abstract class.
- The above class is the base class of IntentId, FlowId, and MatchActionId.
 -- Intent objects use IntentId class for its ID.
 -- IFlow objects use FlowId class for its ID.
 -- MatchAction objects use MatchActionId class for its ID.
- BatchOperation classes requires the BatchOperationTargetId as the target object's ID.
- This work is a part of ONOS-1758.

Change-Id: I71bb4e6acd3836d1ced3beb6fb331bca451abdc3
diff --git a/src/main/java/net/onrc/onos/api/intent/IIntentRuntimeService.java b/src/main/java/net/onrc/onos/api/intent/IIntentRuntimeService.java
index 5e9ed52..2b8774b 100644
--- a/src/main/java/net/onrc/onos/api/intent/IIntentRuntimeService.java
+++ b/src/main/java/net/onrc/onos/api/intent/IIntentRuntimeService.java
@@ -32,7 +32,7 @@
      * @param id ID of the intent to be removed.
      * @return true if succeeded, false otherwise.
      */
-    boolean removeIntent(String id);
+    boolean removeIntent(IntentId id);
 
     /**
      * Overwrites existing intent by new specified intent.
@@ -41,7 +41,7 @@
      * @param intent The new intent to be added.
      * @return true if succeeded, false otherwise.
      */
-    boolean updateIntent(String id, Intent intent);
+    boolean updateIntent(IntentId id, Intent intent);
 
     /**
      * Gets specific intent.
@@ -49,7 +49,7 @@
      * @param id ID of the intent should be retrieved
      * @return Intent if it exists, null otherwise.
      */
-    Intent getIntent(String id);
+    Intent getIntent(IntentId id);
 
     /**
      * Gets all intents.