restart: validate configs with new hostname, add logging

[tstromberg]

Fixes an important root cause issue:

• The kubeconfig endpoint check still referenced IP addresses after we had migrated to using DNS names, causing us to unnecessarily remove files out every stop/start cycle.

Fixes issues which made this difficult to debug:

kubeadm:

• replaced mis-use of reset terminology with reconfigure
• separately log when a file has incorrect endpoint information which needs removal

kverify:

• apiServerHealthz now returns errors
• apiServerHealthz now logs the response body, and includes it with errors

May fix #7704 #7921

This will also make #7895 much easier to debug, but may not fix the underlying issue.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tstromberg

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[tstromberg]

/ok-to-test

[minikube-pr-bot]

kvm2 Driver
docker Driver

[minikube-pr-bot]

kvm2 Driver
Times for minikube: [67.534931004 66.800264081 67.23989479100001]
Average time for minikube: 67.19169662533334

Times for Minikube (PR 8022): [65.43820656700001 65.48533936100002 65.50595167399999]
Average time for Minikube (PR 8022): 65.47649920066668

Averages Time Per Log

+--------------------------------+-----------+--------------------+
|              LOG               | MINIKUBE  | MINIKUBE (PR 8022) |
+--------------------------------+-----------+--------------------+
| * minikube v1.10.0-beta.2 on   |  0.064803 |           0.067240 |
| Debian 9.11                    |           |                    |
| * Using the kvm2 driver based  |  0.023883 |           0.021713 |
| on existing profile            |           |                    |
| * Starting control plane node  |  0.005946 |           0.003789 |
| minikube in cluster minikube   |           |                    |
| * Creating kvm2 VM (CPUs=2,    | 40.897165 |          41.304137 |
| Memory=3700MB, Disk=20000MB)   |           |                    |
| ...                            |           |                    |
| * Preparing Kubernetes v1.18.1 | 23.968936 |          21.874025 |
| on Docker 19.03.8 ...          |           |                    |
| * Verifying Kubernetes         |  1.500286 |           1.362447 |
| components...                  |           |                    |
| * Enabled addons:              |  0.635559 |           0.756147 |
| default-storageclass,          |           |                    |
| storage-provisioner            |           |                    |
| * Done! kubectl is now         |  0.090782 |           0.080114 |
| configured to use "minikube"   |           |                    |
|                                |  0.004338 |           0.006888 |
+--------------------------------+-----------+--------------------+

docker Driver
Times for minikube: [26.591965455 26.071949288 25.504208657]
Average time for minikube: 26.056041133333334

Times for Minikube (PR 8022): [26.311212225000006 27.346009181999996 26.412358615]
Average time for Minikube (PR 8022): 26.689860007333333

Averages Time Per Log

+----------------------------------------+-----------+--------------------+
|                  LOG                   | MINIKUBE  | MINIKUBE (PR 8022) |
+----------------------------------------+-----------+--------------------+
| * minikube v1.10.0-beta.2 on           |  0.075176 |           0.075682 |
| Debian 9.11                            |           |                    |
| * Using the docker driver              |  0.002376 |           0.002600 |
| based on existing profile              |           |                    |
| * Starting control plane node          |  0.058384 |           0.060507 |
| minikube in cluster minikube           |           |                    |
| * Creating docker container            |  7.596480 |           7.539181 |
| (CPUs=2, Memory=3700MB) ...            |           |                    |
| * Preparing Kubernetes v1.18.1         |  0.145236 |           0.144789 |
| on Docker 19.03.2 ...                  |           |                    |
|   -                                    | 17.052807 |          17.659135 |
| kubeadm.pod-network-cidr=10.244.0.0/16 |           |                    |
| * Verifying Kubernetes                 |  0.847045 |           1.131427 |
| components...                          |           |                    |
| * Enabled addons:                      |  0.210266 |           0.003059 |
| default-storageclass,                  |           |                    |
| storage-provisioner                    |           |                    |
| * Done! kubectl is now                 |  0.065099 |           0.068530 |
| configured to use "minikube"           |           |                    |
|                                        |  0.003173 |           0.004950 |
+----------------------------------------+-----------+--------------------+

[medyagh]

approved with required comment with links for integration test failures.