Supports methods to get interface-related information in ovsdbclient service.

Change-Id: Ic7e45178c8adc9b207b43d893e64b1f2f47cebd4
diff --git a/protocols/ovsdb/api/src/test/java/org/onosproject/ovsdb/controller/driver/OvsdbClientServiceAdapter.java b/protocols/ovsdb/api/src/test/java/org/onosproject/ovsdb/controller/driver/OvsdbClientServiceAdapter.java
index 2d2b674..87dcc0b 100644
--- a/protocols/ovsdb/api/src/test/java/org/onosproject/ovsdb/controller/driver/OvsdbClientServiceAdapter.java
+++ b/protocols/ovsdb/api/src/test/java/org/onosproject/ovsdb/controller/driver/OvsdbClientServiceAdapter.java
@@ -48,6 +48,7 @@
 
 import com.fasterxml.jackson.databind.JsonNode;
 import com.google.common.util.concurrent.ListenableFuture;
+import org.onosproject.ovsdb.rfc.table.Interface;
 import org.onosproject.ovsdb.rfc.table.OvsdbTable;
 
 /**
@@ -218,6 +219,16 @@
     }
 
     @Override
+    public Set<Interface> getInterfaces() {
+        return null;
+    }
+
+    @Override
+    public Interface getInterface(String intf) {
+        return null;
+    }
+
+    @Override
     public boolean isConnected() {
         return false;
     }