Refactor: move default model implementation from app to api

Change-Id: Icfc6c2a4831abbcf28642ee95305415b3f08e6f5
diff --git a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/codec/DpdkInterfaceCodec.java b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/codec/DpdkInterfaceCodec.java
index 033bfc0..2d38221 100644
--- a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/codec/DpdkInterfaceCodec.java
+++ b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/codec/DpdkInterfaceCodec.java
@@ -21,7 +21,7 @@
 import org.onosproject.codec.JsonCodec;
 import org.onosproject.openstacknode.api.DpdkInterface;
 import org.onosproject.openstacknode.api.DpdkInterface.Type;
-import org.onosproject.openstacknode.impl.DefaultDpdkInterface;
+import org.onosproject.openstacknode.api.DefaultDpdkInterface;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.onlab.util.Tools.nullIsIllegal;