Fix ONU port name for Zyxel OLT

Change-Id: I43dde77cf19900179b0dbbdbf7750944175c95d0
diff --git a/deployment-configs/berlin-community-pod-2-xgspon-zyxel-DT.yaml b/deployment-configs/berlin-community-pod-2-xgspon-zyxel-DT.yaml
index 01e8053..218ea0c 100644
--- a/deployment-configs/berlin-community-pod-2-xgspon-zyxel-DT.yaml
+++ b/deployment-configs/berlin-community-pod-2-xgspon-zyxel-DT.yaml
@@ -69,7 +69,7 @@
         dp_iface_name: eth1.7
         container_type: LXC
         container_name: ZYXE8CAC752C
-        onu: ZYXE8CAC752C
+        onu: ZYXE8cac752c
         olt: S210Z14009247
         c_tag: 7
         s_tag: 41