Update kubernetes dependency to 1.15.0.

Signed-off-by: Lantao Liu <lantaol@google.com>

pkg/store/container/container.go

@@ -21,7 +21,7 @@ import (
 
 	"github.com/containerd/containerd"
 	"github.com/docker/docker/pkg/truncindex"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 
 	cio "github.com/containerd/cri/pkg/server/io"
 	"github.com/containerd/cri/pkg/store"

pkg/store/container/container_test.go

@@ -21,7 +21,7 @@ import (
 	"time"
 
 	assertlib "github.com/stretchr/testify/assert"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 
 	cio "github.com/containerd/cri/pkg/server/io"
 	"github.com/containerd/cri/pkg/store"

pkg/store/container/metadata.go

@@ -20,7 +20,7 @@ import (
 	"encoding/json"
 
 	"github.com/pkg/errors"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 )
 
 // NOTE(random-liu):

pkg/store/container/metadata_test.go

@@ -21,7 +21,7 @@ import (
 	"testing"
 
 	assertlib "github.com/stretchr/testify/assert"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 )
 
 func TestMetadataMarshalUnmarshal(t *testing.T) {

pkg/store/container/status.go

@@ -25,7 +25,7 @@ import (
 
 	"github.com/containerd/continuity"
 	"github.com/pkg/errors"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 )
 
 // The container state machine in the CRI plugin:

pkg/store/container/status_test.go

@@ -27,7 +27,7 @@ import (
 
 	assertlib "github.com/stretchr/testify/assert"
 	requirelib "github.com/stretchr/testify/require"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 )
 
 func TestContainerState(t *testing.T) {

pkg/store/sandbox/metadata.go

@@ -21,7 +21,7 @@ import (
 
 	cni "github.com/containerd/go-cni"
 	"github.com/pkg/errors"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 )
 
 // NOTE(random-liu):

pkg/store/sandbox/metadata_test.go

@@ -21,7 +21,7 @@ import (
 	"testing"
 
 	assertlib "github.com/stretchr/testify/assert"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 )
 
 func TestMetadataMarshalUnmarshal(t *testing.T) {

pkg/store/sandbox/sandbox_test.go

@@ -20,7 +20,7 @@ import (
 	"testing"
 
 	assertlib "github.com/stretchr/testify/assert"
-	runtime "k8s.io/kubernetes/pkg/kubelet/apis/cri/runtime/v1alpha2"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
 
 	"github.com/containerd/cri/pkg/store"
 )