Cherry-pick from https://gerrit.onos.onlab.us/#/c/337/

Add a rollback method for clearing cache of IDeviceObject.
Call the rollback method in Forwarding.class.

Change-Id: I32c85708a5595c7cd70f239eaefd1f2f96812de1
diff --git a/src/main/java/net/onrc/onos/ofcontroller/core/IDeviceStorage.java b/src/main/java/net/onrc/onos/ofcontroller/core/IDeviceStorage.java
index 2eddadf..9818b1b 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/core/IDeviceStorage.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/core/IDeviceStorage.java
@@ -14,6 +14,8 @@
 	public IDeviceObject getDeviceByIP(int ipv4Address);
 	public void changeDeviceAttachments(IDevice device);
 	public void changeDeviceIPv4Address(IDevice device);
+	public void rollback();
+	public void commit();
 	
 	public void addOnosDevice(OnosDevice onosDevice);
 }