polls GitHub for the current Kubernetes Stable release and latest RC or Beta pre-release, then automatically updates local repo and/or creates a unique PR in kubernetes/minikube repo

* force dependency for release purposes

* revert original idea and add loads of debugging

* hey more debugging cool

* fix debugging

* drilling down debugging

* revert to original solution

* fix comment

update_kubernetes_version: implement a standalone program that polls GitHub for the latest Kubernetes release

$ sed -i 's/miniube start/minikube start/g' $(git grep -l 'miniube start')

Fixes: #9018
Signed-off-by: NLi Zhijian <lizhijian@cn.fujitsu.com>

if there is insufficient storage. Output now looks like:

```
{
  "Name": "minikube",
  "StatusCode": 507,
  "StatusName": "InsufficientStorage",
  "StatusDetail": "/var is almost out of disk space",
  "Step": "Starting Node",
  "StepDetail": "Updating the running docker \"minikube\" container ...",
  "BinaryVersion": "v1.12.3",
  "Components": {
    "kubeconfig": {
      "Name": "kubeconfig",
      "StatusCode": 500,
      "StatusName": ""
    }
  },
  "Nodes": [
    {
      "Name": "minikube",
      "StatusCode": 507,
      "StatusName": "InsufficientStorage",
      "Components": {
        "apiserver": {
          "Name": "apiserver",
          "StatusCode": 405,
          "StatusName": "Stopped"
        },
        "kubelet": {
          "Name": "kubelet",
          "StatusCode": 405,
          "StatusName": "Stopped"
        }
      }
    }
  ]
}
```

Signed-off-by: NPablo Caderno <kaderno@gmail.com>

* metadata addon works

* Add code for metadata server image and makefile rules

* remove log message

* update to work with v1.13.11

* update readme

* fix metadata addon stuff for newer codebase

* buncha changes

* just so many changes

* ch-ch-ch-ch-changes

* addon works

* update readme

* boilerplate

* revert unrelated change

* move server code to another repo

* switch addon name to gcp-auth

* metadata -> gcp-auth

* missed one

* automate finding of credentials

* remove unnecessary comment

* address comments

* Update README.md

* Update README.md

* use mustload everywhere

* swap selector condition

* upgrade kube-webhook-certgen to 1.3

* move paths to constants

* add notice to user on addon enable

* adding addon documentation

* move addons documentation inside handbook

* remove old addons docs location
Co-authored-by: NPriya Wadhwa <priyawadhwa@google.com>

This PR:

1. Adds an integration test to test minikube against the latest skaffold release
1. Adds in a sample skaffold app from the skaffold repo to test
1. Adds this test to the addons_certs_docker_ubuntu Github Actions test

both the scheduler and controller manager constantly ping the apiserver to ensure leader election. From the docs:

```
Enable this when running replicated components for high availability.
```

which we don't really need in minikube. This should reduce overall overhead by ~12%