Fix Maven build breakage due to new SNMP libraries

Change-Id: I48cadd37c0e862a987be04d1c99efbe99f4e9b52
diff --git a/protocols/snmp/ctl/src/test/java/org/onosproject/snmp/ctl/ISnmpSessionAdapter.java b/protocols/snmp/ctl/src/test/java/org/onosproject/snmp/ctl/ISnmpSessionAdapter.java
index 3f9347d..042e4f5 100644
--- a/protocols/snmp/ctl/src/test/java/org/onosproject/snmp/ctl/ISnmpSessionAdapter.java
+++ b/protocols/snmp/ctl/src/test/java/org/onosproject/snmp/ctl/ISnmpSessionAdapter.java
@@ -55,6 +55,12 @@
     }
 
     @Override
+    public WalkResponse getTableRowsForColumns(IVariableBindingHandler iVariableBindingHandler,
+                                               Map<String, OID[]> map) {
+        return null;
+    }
+
+    @Override
     public WalkResponse getTableRows(IVariableBindingHandler networkDevice,
                                      Map<DeviceEntityDescription, List<OID>> tableIndexes)
             throws IOException {
@@ -80,4 +86,4 @@
     public void checkErrorCodeAndDescription() throws SnmpIoException {
 
     }
-}
\ No newline at end of file
+}