closes open file descriptors to prevent leaks

[DiptoChakrabarty]

What type of PR is this?

Fixes bug in the kube config file where files were kept open in using the _create_temp_file_with_content function

What this PR does / why we need it:

This PR works on the below mentioned issue and closes the open file descriptor after usage to prevent memory leaks

Which issue(s) this PR fixes:

Fixes kubernetes-client/python#1531

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

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

None

[k8s-ci-robot]

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[fabianvf]

/lgtm

[roycaihw]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DiptoChakrabarty, fabianvf, roycaihw

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