Kill mount process before stopping nodes

[spowelljr]

Fixes #12649

Problem:
minikube stop with the Hyper-V driver and with mount enabled takes 9 minutes to complete. But stopping with the mount process killed takes a normal amount of time.

Solution:
Change order of operations to kill mount process before stopping nodes.

Before: minikube stop took 9 minutes on my machine
Now: minikube stop took 23 seconds

[spowelljr]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sharifelgamal, spowelljr

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[minikube-pr-bot]

kvm2 driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 12716) |
+----------------+----------+---------------------+
| minikube start | 47.1s    | 46.7s               |
| enable ingress | 31.7s    | 31.3s               |
+----------------+----------+---------------------+

Times for minikube start: 49.1s 47.1s 45.7s 46.4s 47.1s
Times for minikube (PR 12716) start: 47.5s 46.7s 46.4s 46.9s 45.9s

Times for minikube ingress: 31.8s 30.3s 33.2s 31.9s 31.2s
Times for minikube (PR 12716) ingress: 31.3s 31.2s 31.8s 31.2s 30.7s

docker driver with docker runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 12716) |
+----------------+----------+---------------------+
| minikube start | 21.6s    | 21.4s               |
| enable ingress | 29.9s    | 30.0s               |
+----------------+----------+---------------------+

Times for minikube start: 21.5s 22.3s 21.3s 20.6s 22.2s
Times for minikube (PR 12716) start: 21.0s 20.5s 20.7s 23.6s 21.4s

Times for minikube ingress: 28.4s 34.4s 26.4s 33.9s 26.4s
Times for minikube (PR 12716) ingress: 27.9s 35.4s 26.4s 34.4s 25.9s

docker driver with containerd runtime

+----------------+----------+---------------------+
|    COMMAND     | MINIKUBE | MINIKUBE (PR 12716) |
+----------------+----------+---------------------+
| minikube start | 38.9s    | 39.7s               |
| enable ingress | 28.7s    | 32.5s               |
+----------------+----------+---------------------+

Times for minikube ingress: 28.4s 32.9s 26.5s 36.9s 18.9s
Times for minikube (PR 12716) ingress: 25.4s 38.4s 32.9s 32.9s 32.9s

Times for minikube start: 33.7s 44.1s 36.4s 36.2s 44.0s
Times for minikube (PR 12716) start: 36.7s 30.6s 43.9s 43.8s 43.7s

[minikube-pr-bot]

These are the flake rates of all failed tests.

Environment	Failed Tests	Flake Rate (%)
Docker_Linux_containerd	TestMountStart/serial/StartWithMountFirst (gopogh)	0.00 (chart)
Docker_Linux_containerd	TestMountStart/serial/VerifyMountFirst (gopogh)	0.00 (chart)
Docker_Windows	TestStartStop/group/no-preload/serial/Pause (gopogh)	8.70 (chart)
Docker_Windows	TestNetworkPlugins/group/false/DNS (gopogh)	15.75 (chart)
Docker_Windows	TestDownloadOnlyKic (gopogh)	28.57 (chart)
Docker_Windows	TestDownloadOnly/v1.14.0/preload-exists (gopogh)	28.57 (chart)
Docker_Windows	TestDownloadOnly/v1.22.2/preload-exists (gopogh)	28.57 (chart)
Docker_Windows	TestDownloadOnly/v1.22.3-rc.0/preload-exists (gopogh)	28.57 (chart)
Hyper-V_Windows	TestDownloadOnly/v1.14.0/preload-exists (gopogh)	63.27 (chart)
Hyper-V_Windows	TestDownloadOnly/v1.22.2/preload-exists (gopogh)	63.27 (chart)
Hyper-V_Windows	TestDownloadOnly/v1.22.3-rc.0/preload-exists (gopogh)	63.27 (chart)
Docker_Windows	TestNetworkPlugins/group/custom-weave/Start (gopogh)	72.14 (chart)
Docker_Windows	TestNetworkPlugins/group/calico/Start (gopogh)	82.86 (chart)
Docker_Linux_containerd	TestScheduledStopUnix (gopogh)	100.00 (chart)
Docker_Windows	TestCertOptions (gopogh)	100.00 (chart)
Docker_Windows	TestPause/serial/VerifyDeletedResources (gopogh)	100.00 (chart)
Hyper-V_Windows	TestMultiNode/serial/PingHostFrom2Pods (gopogh)	100.00 (chart)
Hyper-V_Windows	TestMultiNode/serial/RestartKeepsNodes (gopogh)	100.00 (chart)
Hyper-V_Windows	TestRunningBinaryUpgrade (gopogh)	100.00 (chart)
Hyper-V_Windows	TestStoppedBinaryUpgrade/Upgrade (gopogh)	100.00 (chart)

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