Merge pull request #1478 from delfer/patch-2

[terraform/openstack] fixed mistake in README.md

contrib/terraform/openstack/README.md

@@ -230,11 +230,6 @@ kubectl config set-credentials default-admin \
     --client-key=admin-key.pem \
     --client-certificate=admin.pem 
 
-kubectl config set-credentials default-admin \
-    --certificate-authority=ca.pem \
-    --client-key=admin-key.pem \
-    --client-certificate=admin.pem 
-
 kubectl config set-context default-system --cluster=default-cluster --user=default-admin
 kubectl config use-context default-system
 ```