update kubernetes-dashboard image version to v1.7.1

[zouyee]

/cc @r2d4 fixes high cpu suage

[k8s-ci-robot]

@zouyee: GitHub didn't allow me to request PR reviews from the following users: suage, fix, high, cpu.

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In response to this:

/cc @r2d4 fix high cpu suage

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[minikube-bot]

Can one of the admins verify this patch?

[codecov-io]

Codecov Report

Merging #2081 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2081   +/-   ##
=======================================
  Coverage   28.92%   28.92%           
=======================================
  Files          81       81           
  Lines        5311     5311           
=======================================
  Hits         1536     1536           
  Misses       3582     3582           
  Partials      193      193

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[r2d4]

@minikube-bot ok to test

[maciaszczykm]

Do not merge it.

[r2d4]

Holding off on this

[maciaszczykm]

It is incorrect/incomplete because since 1.7.0 we tend to use a more secure setup where Dashboard is not using cluster role privileges. YAML files should be updated, but we are still discussing it with the core team. One of @kubernetes/dashboard-maintainers will do it soon. Please close it.