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/install/ansible/group_vars/all b/install/ansible/group_vars/all
index 9ab3722..af887c2 100644
--- a/install/ansible/group_vars/all
+++ b/install/ansible/group_vars/all
@@ -14,3 +14,5 @@
 registry_volume_size: 5
 consul_volume_size: 5
 logger_volume_size: 20
+install_source: /home/vinstall
+voltha_namespace: voltha