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/envoy_for_consul.yml b/k8s/envoy_for_consul.yml
index b93ee2e..1d9f1e0 100644
--- a/k8s/envoy_for_consul.yml
+++ b/k8s/envoy_for_consul.yml
@@ -35,7 +35,7 @@
     spec:
       containers:
         - name: voltha
-          image: "voltha/envoy:latest"
+          image: voltha-envoy
           env:
             - name: POD_IP
               valueFrom: