Unpin voltha-onos, add config for dataplane tests

Change-Id: Ie4903881cfaa0ebfd7c9185ac20800ca5cf79919
diff --git a/kubernetes-configs/voltha/tucson-pod.yml b/kubernetes-configs/voltha/tucson-pod.yml
index 0acb97a..06e9b4f 100644
--- a/kubernetes-configs/voltha/tucson-pod.yml
+++ b/kubernetes-configs/voltha/tucson-pod.yml
@@ -12,7 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-images:
-  onos:
-    repository: voltha/voltha-onos@sha256
-    tag: 9f781ace4c6f4bf3b2e5ff9cb9f26aa4b328284da1d6b6523636dca1375d7666
+# This file can be used to override values in kind-voltha's minimal-values.yaml