Dev image for adtran olt to fix ONT reboot issue

Change-Id: I196db59aa07af5f052ffcb9482e750e90aa1d5e7
diff --git a/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml b/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml
index 4e84a14..745815b 100644
--- a/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml
+++ b/kubernetes-configs/voltha/dt-berlin-pod-gpon-adtran.yml
@@ -26,7 +26,7 @@
   adapter_adtran_olt:
     registry: "10.34.90.43:443/"
     repository: "voltha-adtran-adapter"
-    tag: "1.7.0"
+    tag: "1.8.0.dev1"
 #  onos:
 #    repository: "andreacampanella/voltha-onos"
 #    tag: "app-update-sadis"