Add unit test for cmd/minikube/cmd/config/get.go
Add unit test for cmd/minikube/cmd/config/get.go

Signed-off-by: Dao Cong Tien <1c4ce126680ad816eec0a59ffe5c2a98ccd36526@vn.fujitsu.com>

kubernetes/minikube,dlorenc/minikube,warmchang/minikube,dalehamel/minikube,warmchang/minikube,warmchang/minikube,warmchang/minikube,dalehamel/minikube,kubernetes/minikube,dalehamel/minikube,dlorenc/minikube,kubernetes/minikube,kubernetes/minikube,warmchang/minikube,kubernetes/minikube,dlorenc/minikube,warmchang/minikube,kubernetes/minikube,dlorenc/minikube,dlorenc/minikube,dlorenc/minikube,dlorenc/minikube,warmchang/minikube,kubernetes/minikube,dlorenc/minikube