Improve perf test coverage

[n0npax]

Improve test coverage for perf package

[k8s-ci-robot]

Hi @n0npax. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: n0npax
To complete the pull request process, please assign afbjorklund
You can assign the PR to them by writing /assign @afbjorklund in a comment when ready.

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[minikube-bot]

Can one of the admins verify this patch?

[TravisBuddy]

Travis tests have failed

Hey @n0npax,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

TravisBuddy Request Identifier: 386b6260-85c3-11ea-8961-b5c8adb971c9

[codecov-io]

Codecov Report

Merging #7880 into master will increase coverage by 0.33%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7880      +/-   ##
==========================================
+ Coverage   35.57%   35.90%   +0.33%     
==========================================
  Files         148      148              
  Lines        9297     9305       +8     
==========================================
+ Hits         3307     3341      +34     
+ Misses       5593     5564      -29     
- Partials      397      400       +3     

Impacted Files	Coverage Δ
cmd/minikube/cmd/start.go	15.42% <0.00%> (ø)
pkg/minikube/machine/cache_images.go	0.00% <0.00%> (ø)
cmd/minikube/cmd/start_flags.go	50.98% <0.00%> (+0.16%)	⬆️
pkg/minikube/bootstrapper/bsutil/kubeadm.go	83.56% <0.00%> (+0.46%)	⬆️
pkg/minikube/bootstrapper/bsutil/extraconfig.go	81.57% <0.00%> (+0.75%)	⬆️
pkg/minikube/perf/binary.go	78.94% <0.00%> (+73.68%)	⬆️

[RA489]

/ok-to-test

[minikube-pr-bot]

kvm2 Driver
docker Driver

[n0npax]

/retest

[priyawadhwa]

Thank you so much for your contribution, this is great!