Fixed router and domain address order in IpAssignment build method

Change-Id: I3941c88f3b27bda0621c7a5e7fa56935fb924998
diff --git a/apps/dhcp/api/src/main/java/org/onosproject/dhcp/IpAssignment.java b/apps/dhcp/api/src/main/java/org/onosproject/dhcp/IpAssignment.java
index 5610fec..1de45a2 100644
--- a/apps/dhcp/api/src/main/java/org/onosproject/dhcp/IpAssignment.java
+++ b/apps/dhcp/api/src/main/java/org/onosproject/dhcp/IpAssignment.java
@@ -232,7 +232,7 @@
         public IpAssignment build() {
             validateInputs();
             return new IpAssignment(ipAddress, leasePeriod, timeStamp, assignmentStatus, subnetMask,
-                    dhcpServer, domainServer, routerAddress, rangeNotEnforced);
+                    dhcpServer, routerAddress, domainServer, rangeNotEnforced);
         }
 
         public Builder ipAddress(Ip4Address addr) {