Respect flags of testing package

`go test -c -o "perf.test"`
`./perf.test --help` doesn't understand "help" flag without
calling `flag.Parse` explicitly.

test/integration/scheduler_perf/main_test.go

@@ -17,11 +17,13 @@ limitations under the License.
 package benchmark
 
 import (
+	"flag"
 	"testing"
 
 	"k8s.io/kubernetes/test/integration/framework"
 )
 
 func TestMain(m *testing.M) {
+	flag.Parse()
 	framework.EtcdMain(m.Run)
 }