Fix/recreate deleted temp files

[NicoPolazzi]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Adds missing test case for a bug fix presented in PR: #2441.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Fixed a bug in kubeconfig content may be gone when using temp file. The client now recreates the file with the content if the file was removed by the system. 

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

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: NicoPolazzi / name: Nicolò Polazzi (25f5c73)
• ✅ login: mazanax / name: Alexander (ce901f3)

[k8s-ci-robot]

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[roycaihw]

/assign

[roycaihw]

LGTM. Waiting for the test to pass

[roycaihw]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: NicoPolazzi, roycaihw

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