Clean up go modules (#127)

This is a follow up PR to clean up go modules after we swtich to volcano-api. Removing kubernetes unrelated dependencies help reduce size the repo, especially for users who use `go mod vendor` or `go mod download`

Signed-off-by: Jiaxin Shan <[email protected]>

go.mod

@@ -13,34 +13,14 @@ require (
 	k8s.io/api v0.16.15
 	k8s.io/apimachinery v0.16.15
 	k8s.io/client-go v0.16.15
-	k8s.io/code-generator v0.18.3
-	k8s.io/kube-openapi v0.0.0-20190816220812-743ec37842bf
+	k8s.io/code-generator v0.16.15
+	k8s.io/kube-openapi v0.0.0-20200410163147-594e756bea31
 	volcano.sh/apis v1.2.0-k8s1.16.15
 )
 
 replace (
 	k8s.io/api => k8s.io/api v0.16.9
-	k8s.io/apiextensions-apiserver => k8s.io/apiextensions-apiserver v0.16.9
 	k8s.io/apimachinery => k8s.io/apimachinery v0.16.10-beta.0
-	k8s.io/apiserver => k8s.io/apiserver v0.16.9
-	k8s.io/cli-runtime => k8s.io/cli-runtime v0.16.9
 	k8s.io/client-go => k8s.io/client-go v0.16.9
-	k8s.io/cloud-provider => k8s.io/cloud-provider v0.16.9
-	k8s.io/cluster-bootstrap => k8s.io/cluster-bootstrap v0.16.9
 	k8s.io/code-generator => k8s.io/code-generator v0.16.10-beta.0
-	k8s.io/component-base => k8s.io/component-base v0.16.9
-	k8s.io/cri-api => k8s.io/cri-api v0.16.10-beta.0
-	k8s.io/csi-translation-lib => k8s.io/csi-translation-lib v0.16.9
-	k8s.io/kube-aggregator => k8s.io/kube-aggregator v0.16.9
-	k8s.io/kube-controller-manager => k8s.io/kube-controller-manager v0.16.9
-	k8s.io/kube-proxy => k8s.io/kube-proxy v0.16.9
-	k8s.io/kube-scheduler => k8s.io/kube-scheduler v0.16.9
-	k8s.io/kubectl => k8s.io/kubectl v0.16.9
-	k8s.io/kubelet => k8s.io/kubelet v0.16.9
-	k8s.io/legacy-cloud-providers => k8s.io/legacy-cloud-providers v0.16.9
-	k8s.io/metrics => k8s.io/metrics v0.16.9
-	k8s.io/node-api => k8s.io/node-api v0.16.9
-	k8s.io/sample-apiserver => k8s.io/sample-apiserver v0.16.9
-	k8s.io/sample-cli-plugin => k8s.io/sample-cli-plugin v0.16.9
-	k8s.io/sample-controller => k8s.io/sample-controller v0.16.9
 )