release scripts: use dash instead of underscore for RPM filenames
release scripts: use dash instead of underscore for RPM filenames

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