Make e2e.test binary know about KUBECONFIG env var

test/e2e/e2e.go

@@ -61,7 +61,7 @@ func RegisterFlags() {
 	// Randomize specs as well as suites
 	config.GinkgoConfig.RandomizeAllSpecs = true
 
-	flag.StringVar(&testContext.KubeConfig, clientcmd.RecommendedConfigPathFlag, "", "Path to kubeconfig containing embedded authinfo.")
+	flag.StringVar(&testContext.KubeConfig, clientcmd.RecommendedConfigPathFlag, os.Getenv(clientcmd.RecommendedConfigPathEnvVar), "Path to kubeconfig containing embedded authinfo.")
 	flag.StringVar(&testContext.KubeContext, clientcmd.FlagContext, "", "kubeconfig context to use/override. If unset, will use value from 'current-context'")
 	flag.StringVar(&testContext.KubeVolumeDir, "volume-dir", "/var/lib/kubelet", "Path to the directory containing the kubelet volumes.")
 	flag.StringVar(&testContext.CertDir, "cert-dir", "", "Path to the directory containing the certs. Default is empty, which doesn't use certs.")