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/ingress/80-ingress.yml b/k8s/ingress/80-ingress.yml
new file mode 100644
index 0000000..c665801
--- /dev/null
+++ b/k8s/ingress/80-ingress.yml
@@ -0,0 +1,23 @@
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: voltha-ingress
+  annotations:
+    kubernetes.io/ingress.class: "nginx"
+    ingress.kubernetes.io/rewrite-target: /
+spec:
+  rules:
+  - host: k8s-consul
+    http:
+      paths:
+      - path: /
+        backend:
+          serviceName: consul
+          servicePort: 8500
+  - host: k8s-grafana
+    http:
+      paths:
+      - path: /
+        backend:
+          serviceName: grafana
+          servicePort: 8883