Kubelet tests broken on Macs with uppercase names

Hostname behavior across operating systems is inconsistent (Macs can
have uppercase host names, so can some other systems).  In general,
always strings.ToLower(os.Hostname()).

pkg/kubelet/config/config.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"os"
 	"reflect"
+	"strings"
 	"sync"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
@@ -367,5 +368,6 @@ func GeneratePodName(name string) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	hostname = strings.ToLower(hostname)
 	return fmt.Sprintf("%s-%s", name, hostname), nil
 }

pkg/kubelet/config/file.go

@@ -25,6 +25,7 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+	"strings"
 	"time"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
@@ -172,6 +173,7 @@ func extractFromFile(filename string) (api.BoundPod, error) {
 	if err != nil {
 		return pod, err
 	}
+	hostname = strings.ToLower(hostname)
 
 	if len(pod.UID) == 0 {
 		hasher := md5.New()

pkg/kubelet/config/http_test.go

@@ -20,6 +20,7 @@ import (
 	"encoding/json"
 	"net/http/httptest"
 	"os"
+	"strings"
 	"testing"
 	"time"
 
@@ -118,6 +119,7 @@ func TestExtractInvalidManifest(t *testing.T) {
 
 func TestExtractFromHTTP(t *testing.T) {
 	hostname, _ := os.Hostname()
+	hostname = strings.ToLower(hostname)
 
 	var testCases = []struct {
 		desc      string

pkg/util/node.go

@@ -34,5 +34,5 @@ func GetHostname(hostnameOverride string) string {
 		}
 		hostname = fqdn
 	}
-	return strings.TrimSpace(string(hostname))
+	return strings.ToLower(strings.TrimSpace(string(hostname)))
 }