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/install.cfg b/install/install.cfg
index 964800f..4bf0b66 100644
--- a/install/install.cfg
+++ b/install/install.cfg
@@ -10,3 +10,15 @@
 # The space reserved for Consul's storage
 # consulLimit=5
 
+# Specify the cluster framework type (swarm or kubernetes)
+cluster_framework="swarm"
+
+# Docker registry address
+#cluster_registry="localhost:5000"
+
+# Address range for kubernetes services
+#cluster_service_subnet="192.168.0.0\/18"
+
+# Address range for kubernetes pods
+#cluster_pod_subnet="192.168.64.0\/18"
+