VOL-569: Create kubernetes deployment configuration for each voltha service

This update:
- renames all voltha images referenced in kubernetes deployment files
  to the 'voltha-<component>' format
- adds the kubernetes deployment files for grafana, dashd, and shovel
- adds deployment files for an Ingress resource and an nginx-based ingress
  controller to allow access to the Consul and Grafana UIs from outside
  the cluster

Manifest file ingress/05-namespace.yml sets up a namespace 'ingress-nginx'
for all ingress-related resources. This file will be deleted once we move
all voltha components, including ingress, to a 'voltha' namespace.

Deployment instructions for the ingress resources are provided in README.md.

Change-Id: I0459e838318c43e21f40e83b314f77fc9e0456f8
diff --git a/k8s/netconf.yml b/k8s/netconf.yml
index 5d999ba..125e3e1 100644
--- a/k8s/netconf.yml
+++ b/k8s/netconf.yml
@@ -34,7 +34,7 @@
               topologyKey: kubernetes.io/hostname
       containers:
       - name: netconf
-        image: "cord/netconf:latest"
+        image: voltha-netconf
         imagePullPolicy: Never
         ports:
         - containerPort: 830