Add MCS label support

Carry of #1246

Signed-off-by: Darren Shepherd <darren@rancher.com>
Signed-off-by: Michael Crosby <michael@thepasture.io>

pkg/server/sandbox_run_unix_test.go

@@ -25,6 +25,7 @@ import (
 
 	imagespec "github.com/opencontainers/image-spec/specs-go/v1"
 	runtimespec "github.com/opencontainers/runtime-spec/specs-go"
+	"github.com/opencontainers/selinux/go-selinux"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
@@ -76,6 +77,11 @@ func getRunPodSandboxTestData() (*runtime.PodSandboxConfig, *imagespec.ImageConf
 
 		assert.Contains(t, spec.Annotations, annotations.SandboxLogDir)
 		assert.EqualValues(t, spec.Annotations[annotations.SandboxLogDir], "test-log-directory")
+
+		if selinux.GetEnabled() {
+			assert.NotEqual(t, "", spec.Process.SelinuxLabel)
+			assert.NotEqual(t, "", spec.Linux.MountLabel)
+		}
 	}
 	return config, imageConfig, specCheck
 }