Add deploymentUriPublic to deployment-finished events

[christian-kreuzberger-dtx]

As proposed in KEP-0005, the deploymentUriPublic could be used for deployment-finished events in the notification service.

This feature has been implemented in Keptn 0.6.1 (see keptn/keptn#1402 for progress). The payload should look as follows:

{
  "contenttype": "application/json",
  "data": {
    "deploymentURILocal": "carts.sockshop-dev",
    "deploymentURIPublic": "https://carts.sockshop-dev.mykeptnhost.com",
    "deploymentstrategy": "direct",
    "image": "docker.io/keptnexamples/carts",
    "labels": null,
    "project": "sockshop",
    "service": "carts",
    "stage": "dev",
    "tag": "0.10.3",
    "teststrategy": "functional"
  },
  "id": "ae470603-026f-4983-a2b7-8a0aa061ba46",
  "source": "helm-service",
  "specversion": "0.2",
  "time": "2020-02-26T12:28:02.599Z",
  "type": "sh.keptn.events.deployment-finished",
  "shkeptncontext": "25590055-23c9-4828-aea1-35557bf4c282"
}