Fix the bug in functional_test/docker-env, which is caused by a wrong charator.
Fix the bug in functional_test/docker-env, which is caused by a wrong charator.

warmchang/minikube,kubernetes/minikube,warmchang/minikube,warmchang/minikube,warmchang/minikube,kubernetes/minikube,kubernetes/minikube,warmchang/minikube,kubernetes/minikube,kubernetes/minikube,warmchang/minikube,kubernetes/minikube,warmchang/minikube,kubernetes/minikube