Fix dhcp6Relay

- interfaceIdOption does not proper encode vlanId
- AddHost was not using the actual vlan of the host

Change-Id: I41a639cc4f7efc0c7159f5bab07166d4032fc60a
diff --git a/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerUtil.java b/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerUtil.java
index 45e94c0..8936cc6 100644
--- a/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerUtil.java
+++ b/apps/dhcprelay/app/src/main/java/org/onosproject/dhcprelay/Dhcp6HandlerUtil.java
@@ -452,8 +452,8 @@
         byte[] clientSoureMacBytes = clientPacket.getSourceMACAddress();
         byte[] inPortStringBytes = inPortString.getBytes();
         byte[] vlanIdBytes = new byte[2];
-        vlanIdBytes[0] = (byte) (clientPacket.getVlanID() & 0xff);
-        vlanIdBytes[1] = (byte) ((clientPacket.getVlanID() >> 8) & 0xff);
+        vlanIdBytes[0] = (byte) ((clientPacket.getVlanID() >> 8) & 0xff);
+        vlanIdBytes[1] = (byte) (clientPacket.getVlanID() & 0xff);
         byte[] interfaceIdBytes = new byte[clientSoureMacBytes.length +
                 inPortStringBytes.length + vlanIdBytes.length];
         log.debug("Length: interfaceIdBytes  {} clientSoureMacBytes {} inPortStringBytes {} vlan {}",
@@ -468,8 +468,8 @@
                 vlanIdBytes.length);
         interfaceId.setData(interfaceIdBytes);
         interfaceId.setLength((short) interfaceIdBytes.length);
-        log.debug("interfaceId write srcMac {} portString {}",
-                HexString.toHexString(clientSoureMacBytes, ":"), inPortString);
+        log.debug("interfaceId write srcMac {} portString {}, vlanId {}",
+                HexString.toHexString(clientSoureMacBytes, ":"), inPortString, vlanIdBytes);
         return interfaceId;
     }