reboot windows machines after every test

[sharifelgamal]

We're having some issues with zombie processes holding on to file locks in our integration testing workspaces so I'm going to try just rebooting machines as often as possible.

Also let's lower the frequency of the cron to every 30 minutes.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sharifelgamal

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[sharifelgamal]

/ok-to-test

[minikube-pr-bot]

kvm2 driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 12667) |
+----------------+----------+---------------------+
| minikube start | 47.6s    | 47.3s               |
| enable ingress | 33.7s    | 31.5s               |
+----------------+----------+---------------------+

Times for minikube start: 49.1s 46.8s 47.5s 47.7s 47.2s
Times for minikube (PR 12667) start: 48.5s 47.8s 47.1s 46.5s 46.4s

Times for minikube ingress: 39.8s 32.8s 33.3s 31.3s 31.4s
Times for minikube (PR 12667) ingress: 31.7s 32.3s 30.9s 32.3s 30.3s

docker driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 12667) |
+----------------+----------+---------------------+
| minikube start | 22.1s    | 21.5s               |
| enable ingress | 32.7s    | 29.6s               |
+----------------+----------+---------------------+

Times for minikube start: 22.9s 21.8s 21.2s 22.6s 21.9s
Times for minikube (PR 12667) start: 20.3s 21.2s 21.5s 23.6s 21.0s

Times for minikube ingress: 35.4s 35.4s 27.9s 30.4s 34.5s
Times for minikube (PR 12667) ingress: 28.4s 28.4s 28.4s 27.9s 35.0s

docker driver with containerd runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 12667) |
+----------------+----------+---------------------+
| minikube start | 36.9s    | 43.0s               |
| enable ingress | 36.4s    | 33.1s               |
+----------------+----------+---------------------+

Times for minikube ingress: 32.9s 32.4s 37.9s 42.4s 36.4s
Times for minikube (PR 12667) ingress: 19.6s 41.5s 36.9s 29.4s 37.9s

Times for minikube start: 31.6s 43.3s 42.6s 26.2s 40.9s
Times for minikube (PR 12667) start: 44.3s 36.6s 43.8s 47.6s 42.8s

[minikube-pr-bot]

These are the flake rates of all failed tests.

Environment	Failed Tests	Flake Rate (%)
Docker_Linux_containerd	TestFunctional/serial/LogsFileCmd (gopogh)	13.77 (chart)
Docker_Windows	TestPause/serial/VerifyDeletedResources (gopogh)	55.32 (chart)
Docker_Windows	TestNetworkPlugins/group/enable-default-cni/DNS (gopogh)	58.33 (chart)
Docker_Windows	TestNetworkPlugins/group/custom-weave/Start (gopogh)	74.60 (chart)
Docker_Windows	TestNetworkPlugins/group/kindnet/DNS (gopogh)	78.95 (chart)
Docker_Windows	TestNetworkPlugins/group/bridge/DNS (gopogh)	80.00 (chart)
Docker_Windows	TestNetworkPlugins/group/kubenet/DNS (gopogh)	85.37 (chart)
Docker_Windows	TestNetworkPlugins/group/calico/Start (gopogh)	95.24 (chart)
Docker_Windows	TestCertOptions (gopogh)	99.21 (chart)
Docker_Linux_containerd	TestScheduledStopUnix (gopogh)	100.00 (chart)

To see the flake rates of all tests by environment, click here.