[CORD-1628] DHCP relay app configuration change for multiple servers

Change-Id: I13747d8e6451658dfd9344c428b6aad11bf5af62
(cherry picked from commit 483ac6f0689220425061056e748230efe6d8a1b2)
diff --git a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java
index f5375bf..19123dc 100644
--- a/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java
+++ b/apps/dhcprelay/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerImpl.java
@@ -25,9 +25,11 @@
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.VlanId;
 import org.onosproject.dhcprelay.api.DhcpHandler;
+import org.onosproject.dhcprelay.config.DhcpServerConfig;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.packet.PacketContext;
 
+import java.util.Collection;
 import java.util.Optional;
 
 @Component
@@ -79,4 +81,14 @@
     public void setDhcpServerIp(IpAddress dhcpServerIp) {
 
     }
+
+    @Override
+    public void setDefaultDhcpServerConfigs(Collection<DhcpServerConfig> configs) {
+
+    }
+
+    @Override
+    public void setIndirectDhcpServerConfigs(Collection<DhcpServerConfig> configs) {
+
+    }
 }