Massive refactoring using new daeman library

cmd/hepto/config.go

cmd/hepto/service.go

go.mod

go.sum

pkg/cluster/certs.go

pkg/cluster/cluster.go

pkg/cluster/kubeconfig.go

pkg/cluster/services.go

pkg/cluster/vpn.go

pkg/daeman/manager.go

pkg/daeman/unit.go

pkg/services/certs.go

pkg/services/containerd.go

pkg/services/discovery.go

pkg/services/etcd.go

pkg/services/k8s.go

pkg/services/manager.go

pkg/services/meta.go

pkg/services/vpn.go

pkg/utils/config.go