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/olt.yml b/k8s/olt.yml
index cd64d51..6b18657 100644
--- a/k8s/olt.yml
+++ b/k8s/olt.yml
@@ -45,7 +45,7 @@
              - "-device_type"
              - "OLT"
              - "-onus"
-             - "3"
+             - "4"
              - "-internal_if"
              - "eth0"
              - "-external_if"