fixed metrics-server and added integration tests

[govargo]

What type of PR is this?

/kind bug

What this PR does / why we need it:

The metrics server haven't worked since minikube v1.5.x~ due to changing kubelet version.
This PR fixes the metrics server to be able to work correctly.

Which issue(s) this PR fixes:

Fixes #5859

Does this PR introduce a user-facing change?

Yes.
This PR fixes bug in order to the metrics server addons works successfully.

Before this PR, the metrics server fails because it cannot connect to kubelet

I1107 10:40:32.667494       1 heapster.go:71] /metrics-server --source=kubernetes.summary_api:''
I1107 10:40:32.667545       1 heapster.go:72] Metrics Server version v0.2.1
I1107 10:40:32.667715       1 configs.go:61] Using Kubernetes client with master "https://10.96.0.1:443" and version
I1107 10:40:32.667723       1 configs.go:62] Using kubelet port 10255
I1107 10:40:32.668514       1 heapster.go:128] Starting with Metric Sink
I1107 10:40:33.181569       1 serving.go:308] Generated self-signed cert (apiserver.local.config/certificates/apiserver.crt, apiserver.local.config/certificates/apiserver.key)
I1107 10:40:33.326747       1 heapster.go:101] Starting Heapster API server...
[restful] 2019/11/07 10:40:33 log.go:33: [restful/swagger] listing is available at https:///swaggerapi
[restful] 2019/11/07 10:40:33 log.go:33: [restful/swagger] https:///swaggerui/ is mapped to folder /swagger-ui/
I1107 10:40:33.327930       1 serve.go:85] Serving securely on 0.0.0.0:443
E1107 10:41:05.007656       1 summary.go:97] error while getting metrics summary from Kubelet minikube(192.168.64.44:10255): Get http://192.168.64.44:10255/stats/summary/: dial tcp 192.168.64.44:10255: getsockopt: connection refused

After this PR, the metrics server works successfully via kubernetes service

I1107 10:40:32.667494       1 heapster.go:71] /metrics-server --source=kubernetes.summary_api:''
I1107 10:40:32.667545       1 heapster.go:72] Metrics Server version v0.2.1
I1107 10:40:32.667715       1 configs.go:61] Using Kubernetes client with master "https://10.96.0.1:443" and version
I1107 10:40:32.667723       1 configs.go:62] Using kubelet port 10255
I1107 10:40:32.668514       1 heapster.go:128] Starting with Metric Sink
I1107 10:40:33.181569       1 serving.go:308] Generated self-signed cert (apiserver.local.config/certificates/apiserver.crt, apiserver.local.config/certificates/apiserver.key)
I1107 10:40:33.326747       1 heapster.go:101] Starting Heapster API server...
[restful] 2019/11/07 10:40:33 log.go:33: [restful/swagger] listing is available at https:///swaggerapi
[restful] 2019/11/07 10:40:33 log.go:33: [restful/swagger] https:///swaggerui/ is mapped to folder /swagger-ui/
I1107 10:40:33.327930       1 serve.go:85] Serving securely on 0.0.0.0:443

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

NONE

[k8s-ci-robot]

Hi @govargo. 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.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

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[govargo]

/assign @josedonizetti

[minikube-bot]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

Merging #5932 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5932   +/-   ##
=======================================
  Coverage   36.09%   36.09%           
=======================================
  Files         110      110           
  Lines        8208     8208           
=======================================
  Hits         2963     2963           
  Misses       4854     4854           
  Partials      391      391

[medyagh]

PR Looks promising thanks for fixing it

[medyagh]

/ok-to-test

[medyagh]

Thank you for fixing it and also adding an test for it so we dont break it in the future ! this is good work @govargo