import k8s.io/kubernetes directly lead to unknown revision v0.0.0

[allenhaozi]

when import fluid package in my repo, I got the following error

go: finding module for package github.com/fluid-cloudnative/fluid/api/v1alpha1
go: found github.com/fluid-cloudnative/fluid/api/v1alpha1 in github.com/fluid-cloudnative/fluid v0.5.0
go: github.com/fluid-cloudnative/fluid@v0.5.0 requires
	k8s.io/kubernetes@v1.18.5 requires
	k8s.io/api@v0.0.0: reading https://goproxy.io/k8s.io/api/@v/v0.0.0.mod: 404 Not Found
	server response: not found: k8s.io/api@v0.0.0: invalid version: unknown revision v0.0.0

because fluid import k8s.io/kubernetes directly

fluid/go.mod

Line 30 in b145a98

k8s.io/kubernetes v1.18.5

The components intended to be used as libraries are published as standalone modules like k8s.io/api, k8s.io/apimachinery, k8s.io/client-go, etc, and can be referenced directly.

kubernetes/kubernetes#90358

[allenhaozi]

add replace in go.mod

replace (
	k8s.io/api => k8s.io/api v0.19.0-beta.2
	k8s.io/apiextensions-apiserver => k8s.io/apiextensions-apiserver v0.19.0-beta.2
	k8s.io/apimachinery => k8s.io/apimachinery v0.19.0-beta.2
	k8s.io/apiserver => k8s.io/apiserver v0.19.0-beta.2
	k8s.io/cli-runtime => k8s.io/cli-runtime v0.19.0-beta.2
	k8s.io/client-go => k8s.io/client-go v0.19.0-beta.2
	k8s.io/cloud-provider => k8s.io/cloud-provider v0.19.0-beta.2
	k8s.io/cluster-bootstrap => k8s.io/cluster-bootstrap v0.19.0-beta.2
	k8s.io/code-generator => k8s.io/code-generator v0.19.0-beta.2
	k8s.io/component-base => k8s.io/component-base v0.19.0-beta.2
	k8s.io/cri-api => k8s.io/cri-api v0.19.0-beta.2
	k8s.io/csi-translation-lib => k8s.io/csi-translation-lib v0.19.0-beta.2
	k8s.io/kube-aggregator => k8s.io/kube-aggregator v0.19.0-beta.2
	k8s.io/kube-controller-manager => k8s.io/kube-controller-manager v0.19.0-beta.2
	k8s.io/kube-proxy => k8s.io/kube-proxy v0.19.0-beta.2
	k8s.io/kube-scheduler => k8s.io/kube-scheduler v0.19.0-beta.2
	k8s.io/kubectl => k8s.io/kubectl v0.19.0-beta.2
	k8s.io/kubelet => k8s.io/kubelet v0.19.0-beta.2
	k8s.io/legacy-cloud-providers => k8s.io/legacy-cloud-providers v0.19.0-beta.2
	k8s.io/metrics => k8s.io/metrics v0.19.0-beta.2
	k8s.io/sample-apiserver => k8s.io/sample-apiserver v0.19.0-beta.2
)