fix admin kubeconfig.sh

Change-Id: I9fafb907d2c3dbc209293a52b7176097f05bac2f
diff --git a/kubernetes/files/kubeconfig.sh b/kubernetes/files/kubeconfig.sh
index 861d999..0b029fc 100644
--- a/kubernetes/files/kubeconfig.sh
+++ b/kubernetes/files/kubeconfig.sh
@@ -32,7 +32,7 @@
   name: local
 current-context: ${cluster}
 users:
-- name: ${cluster}
+- name: admin-${cluster}
   user:
     client-certificate-data: |
 ${cert}