[VOL-3690] Using openonu-adapter-go as default

Change-Id: I40304b662384734ca30568071c1ab5a442df6453
diff --git a/releases/voltha-2.5 b/releases/voltha-2.5
index a5c5d3e..9469910 100644
--- a/releases/voltha-2.5
+++ b/releases/voltha-2.5
@@ -22,4 +22,4 @@
 # kind-voltha's default which is 'master'.
 # Also we need to specify the tag for voltha/voltha-onos image since this is
 # not in the ONOS chart.
-export EXTRA_HELM_FLAGS="--set defaults.image_tag=null,images.onos.tag=4.1.8 "
+export EXTRA_HELM_FLAGS="--set defaults.image_tag=null,images.onos.tag=4.1.8,use_openonu_adapter_go=false "