ONOS-6886 Move interface classes from incubator to core

Change-Id: Iaae4d98279e4b77fc3f0b5a63d547921f93aeb46
diff --git a/incubator/api/src/main/java/org/onosproject/incubator/net/neighbour/NeighbourHandlerRegistration.java b/incubator/api/src/main/java/org/onosproject/incubator/net/neighbour/NeighbourHandlerRegistration.java
index 4c55e24..df35319 100644
--- a/incubator/api/src/main/java/org/onosproject/incubator/net/neighbour/NeighbourHandlerRegistration.java
+++ b/incubator/api/src/main/java/org/onosproject/incubator/net/neighbour/NeighbourHandlerRegistration.java
@@ -17,7 +17,7 @@
 package org.onosproject.incubator.net.neighbour;
 
 import org.onosproject.core.ApplicationId;
-import org.onosproject.incubator.net.intf.Interface;
+import org.onosproject.net.intf.Interface;
 
 /**
  * Information about the registration of a neighbour message handler.