Move nested class to top-level class

Because BatchWrite is public and no need to place it as an inner class in
IntentStore interface

Change-Id: I17e87e06baa4f0af55fa30b09a891bc23932a6fd
diff --git a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/DistributedIntentStore.java b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/DistributedIntentStore.java
index 12688fb..5290131 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/intent/impl/DistributedIntentStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/intent/impl/DistributedIntentStore.java
@@ -32,13 +32,14 @@
 import org.apache.felix.scr.annotations.Service;
 import org.onlab.metrics.MetricsService;
 import org.onosproject.core.MetricsHelper;
+import org.onosproject.net.intent.BatchWrite;
 import org.onosproject.net.intent.Intent;
 import org.onosproject.net.intent.IntentEvent;
 import org.onosproject.net.intent.IntentId;
 import org.onosproject.net.intent.IntentState;
 import org.onosproject.net.intent.IntentStore;
 import org.onosproject.net.intent.IntentStoreDelegate;
-import org.onosproject.net.intent.IntentStore.BatchWrite.Operation;
+import org.onosproject.net.intent.BatchWrite.Operation;
 import org.onosproject.store.AbstractStore;
 import org.onosproject.store.serializers.KryoNamespaces;
 import org.onosproject.store.serializers.KryoSerializer;