VOL-572: Integration testing with Kubernetes

* Updated the Kubernetes version installed in the single-node environment from 1.8.5 to 1.9.3.
* Replaced the Weave pod network plugin with Calico
* Updated test_device_state_changes to run in single-node Kubernetes
* Moved test_utils.py from voltha/tests/itests/docutests/ to voltha/tests/itests/.

Change-Id: I472cffec1e0c3a783edaecb375664cd1c6bb93b1
diff --git a/k8s/onu.yml b/k8s/onu.yml
index edea4d2..a243550 100644
--- a/k8s/onu.yml
+++ b/k8s/onu.yml
@@ -19,7 +19,7 @@
   name: onu
   namespace: voltha
 spec:
-   replicas: 3
+   replicas: 4
    template:
      metadata:
        labels: