Support KUBECON env.

[k82cn]

Signed-off-by: Klaus Ma mada3@huawei.com

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[hzxuzhonghu]

kubeConfFile := os.Getenv("KUBECONFIG")
if kubeConfFile == "" {
kubeConfFile = filepath.Join(homeDir(), ".kube", "config")
}

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[hzxuzhonghu]

Let this in, and i will fix the e2e