Fix to prevent downward api change break on older versions

test/e2e/common/BUILD

@@ -41,6 +41,7 @@ go_library(
         "//pkg/kubelet:go_default_library",
         "//pkg/kubelet/sysctl:go_default_library",
         "//pkg/security/apparmor:go_default_library",
+        "//pkg/util/version:go_default_library",
         "//test/e2e/framework:go_default_library",
         "//test/utils:go_default_library",
         "//test/utils/image:go_default_library",

test/e2e/common/downward_api.go

@@ -23,11 +23,14 @@ import (
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/uuid"
+	utilversion "k8s.io/kubernetes/pkg/util/version"
 	"k8s.io/kubernetes/test/e2e/framework"
 
 	. "github.com/onsi/ginkgo"
 )
 
+var hostIPVersion = utilversion.MustParseSemantic("v1.8.0")
+
 var _ = framework.KubeDescribe("Downward API", func() {
 	f := framework.NewDefaultFramework("downward-api")
 
@@ -63,6 +66,7 @@ var _ = framework.KubeDescribe("Downward API", func() {
 	})
 
 	It("should provide pod and host IP as an env var [Conformance]", func() {
+		framework.SkipUnlessServerVersionGTE(hostIPVersion, f.ClientSet.Discovery())
 		podName := "downward-api-" + string(uuid.NewUUID())
 		env := []v1.EnvVar{
 			{