Remove dangling references to k8s_releases.json now that

`get-k8s-versions` is removed.

Makefile

@@ -282,10 +282,6 @@ install-hyperkit-driver: out/docker-machine-driver-hyperkit
 check-release:
 	go test -v ./deploy/minikube/release_sanity_test.go -tags=release
 
-.PHONY: update-releases
-update-releases:
-	gsutil cp deploy/minikube/k8s_releases.json gs://minikube/k8s_releases.json
-
 buildroot-image: $(ISO_BUILD_IMAGE) # convenient alias to build the docker container
 $(ISO_BUILD_IMAGE): deploy/iso/minikube-iso/Dockerfile
 	docker build $(ISO_DOCKER_EXTRA_ARGS) -t $@ -f $< $(dir $<)

deploy/minikube/schema_check.go

@@ -26,7 +26,6 @@ import (
 
 func main() {
 	validateSchema("deploy/minikube/schema.json", "deploy/minikube/releases.json")
-	validateSchema("deploy/minikube/k8s_schema.json", "deploy/minikube/k8s_releases.json")
 	os.Exit(0)
 }
 

pkg/minikube/constants/constants.go

@@ -110,7 +110,6 @@ const (
 	DefaultConfigViewFormat    = "- {{.ConfigKey}}: {{.ConfigValue}}\n"
 	DefaultCacheListFormat     = "{{.CacheImage}}\n"
 	GithubMinikubeReleasesURL  = "https://storage.googleapis.com/minikube/releases.json"
-	KubernetesVersionGCSURL    = "https://storage.googleapis.com/minikube/k8s_releases.json"
 	DefaultWait                = 20
 	DefaultInterval            = 6
 	DefaultClusterBootstrapper = "kubeadm"