Fix599: Multiple Config Files

[ignertic]

config.load_kube_config() uses the last modified config file if there are multiple config files specified in the KUBECONFIG environment variable

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ignertic
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We suggest the following additional approver: roycaihw

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[ignertic]

/assign @roycaihw

[tomplus]

Support for merging multiple configs: #94