Fix for the coredns configmap update: the corefile was not updated, e…

[Tanzp01]

What type of PR is this?

Fix for bug

What this PR does / why we need it:

This change should fix the coredns configmap update, and enable the test can also be run on python3.

Which issue(s) this PR fixes:

Fixes - When test GKE DNS performance with the auto creation of dns-perf-server, the coredns configmap corefile was not updated even if different cache size was set as parameters.

Special notes for your reviewer:

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Tanzp01
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[k8s-ci-robot]

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