VOL-642: Installation of VOLT-HA in a Kubernetes cluster

- Changed existing installer to support swarm and kubernetes
- Using kubespray as the base framework to deploy kubernetes
- Implemented config/deploy/teardown tasks for voltha

Amendments:

- Changed from python to python3 when running the inventory builder

Change-Id: I059fd348b9a749397b373e333b5602944c817745
diff --git a/k8s/consul.yml b/k8s/consul.yml
index b398b7a..0ffcc15 100644
--- a/k8s/consul.yml
+++ b/k8s/consul.yml
@@ -51,6 +51,8 @@
 spec:
   serviceName: consul
   replicas: 3
+  updateStrategy:
+    type: RollingUpdate
   template:
     metadata:
       labels: