[ONOS-4258] Initial implementation of supporting extension in REST

- Support Nicira extension

Change-Id: I62bf4417e43459727ce7d4b1ac929c6cf0b7826f
diff --git a/protocols/openflow/api/src/main/java/org/onosproject/openflow/controller/ExtensionSelectorInterpreter.java b/protocols/openflow/api/src/main/java/org/onosproject/openflow/controller/ExtensionSelectorInterpreter.java
index 740f40f..37726ba 100644
--- a/protocols/openflow/api/src/main/java/org/onosproject/openflow/controller/ExtensionSelectorInterpreter.java
+++ b/protocols/openflow/api/src/main/java/org/onosproject/openflow/controller/ExtensionSelectorInterpreter.java
@@ -17,7 +17,7 @@
 package org.onosproject.openflow.controller;
 
 import com.google.common.annotations.Beta;
-import org.onosproject.net.driver.HandlerBehaviour;
+import org.onosproject.codec.ExtensionSelectorCodec;
 import org.onosproject.net.flow.criteria.ExtensionSelector;
 import org.onosproject.net.flow.criteria.ExtensionSelectorType;
 import org.projectfloodlight.openflow.protocol.OFFactory;
@@ -27,7 +27,7 @@
  * Interprets extension selectors and converts them to/from OpenFlow objects.
  */
 @Beta
-public interface ExtensionSelectorInterpreter extends HandlerBehaviour {
+public interface ExtensionSelectorInterpreter extends ExtensionSelectorCodec {
 
     /**
      * Returns true if the given extension selector is supported by this