Repair kubecontext before checking cluster health

[tstromberg]

This fixes this ugly error noticed by @MarlonGamez and myself:

🤦 Unable to restart cluster, will reset it: getting k8s client: client config: client config: context "minikube" does not exist

With this PR, we no longer unnecessarily call kubeadm reset if the only thing wrong with the cluster is a missing kube config entry. This reduces restart time from 73.83s to 5.4s in this particular scenario:

minikube start && sleep 30 && rm $HOME/.kube/config && minikube start

[k8s-ci-robot]

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[tstromberg]

/ok-to-test

[minikube-pr-bot]

kvm2 Driver
Times for minikube: 64.8s 66.4s 67.0s
Average time for minikube: 66.0s

Times for Minikube (PR 9143): 66.1s 64.6s 65.8s
Average time for Minikube (PR 9143): 65.5s

Averages Time Per Log

+--------------------------------+----------+--------------------+
|              LOG               | MINIKUBE | MINIKUBE (PR 9143) |
+--------------------------------+----------+--------------------+
| * minikube v1.12.3 on Debian   | 0.1s     | 0.1s               |
|                           9.11 |          |                    |
| * Using the kvm2 driver based  | 0.0s     | 0.0s               |
| on user configuration          |          |                    |
| * Starting control plane node  | 0.0s     | 0.0s               |
| minikube in cluster minikube   |          |                    |
| * Creating kvm2 VM (CPUs=2,    | 39.9s    | 40.0s              |
| Memory=3700MB, Disk=20000MB)   |          |                    |
| ...                            |          |                    |
| * Preparing Kubernetes v1.19.0 | 23.8s    | 23.5s              |
| on Docker 19.03.12 ...         |          |                    |
| * Verifying Kubernetes         | 1.6s     | 1.6s               |
| components...                  |          |                    |
| * Enabled addons:              | 0.5s     | 0.2s               |
| default-storageclass,          |          |                    |
| storage-provisioner            |          |                    |
| * Done! kubectl is now         | 0.1s     | 0.1s               |
| configured to use "minikube"   |          |                    |
|                                | 0.0s     | 0.0s               |
+--------------------------------+----------+--------------------+

docker Driver
Times for minikube: 30.3s 29.9s 29.3s
Average time for minikube: 29.8s

Times for Minikube (PR 9143): 28.3s 28.6s 29.7s
Average time for Minikube (PR 9143): 28.9s

Averages Time Per Log

+--------------------------------+----------+--------------------+
|              LOG               | MINIKUBE | MINIKUBE (PR 9143) |
+--------------------------------+----------+--------------------+
| * minikube v1.12.3 on Debian   | 0.1s     | 0.1s               |
|                           9.11 |          |                    |
| * Using the docker driver      | 0.0s     | 0.0s               |
| based on user configuration    |          |                    |
|                                | 0.0s     | 19.0s              |
|                                |          |                    |
| * Starting control plane node  |          |                    |
| minikube in cluster minikube   |          |                    |
| * Creating docker container    |          |                    |
| (CPUs=2, Memory=3700MB) ...    |          |                    |
| * Preparing Kubernetes v1.19.0 |          |                    |
| on Docker 19.03.8 ...          |          |                    |
| * Verifying Kubernetes         |          |                    |
| components...                  |          |                    |
| * Enabled addons:              |          |                    |
| default-storageclass,          |          |                    |
| storage-provisioner            |          |                    |
| * Done! kubectl is now         |          |                    |
| configured to use "minikube"   |          |                    |
|                                |          |                    |
+--------------------------------+----------+--------------------+

[priyawadhwa]

Nice!