Find User Default Region and Cred Setting

[PatrickXYS]

Issue to solve

The issue is found in the kubeflow repo here, the situation is that user use kfctl apply kfctl_aws.yaml can't find their plugin default settings.

Changes we make

Rewrite IsEksCluster function to take default plugin settings without setting AWS_REGION manually.

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This change is 

[k8s-ci-robot]

Hi @PatrickXYS. Thanks for your PR.

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[PatrickXYS]

/assign @Jeffwan

[Jeffwan]

Need to change your implementation

[Jeffwan]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jeffwan

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