test/integration: skip etcd startup for -help flag

By parsing flags in the test's main function before starting etcd we bail out
early without ever starting etcd when the test was invoked with -help.

Otherwise etcd must be available, gets started and then hangs because
flag.Parse itself exits when called by testing.go. This bypasses the code in
EtcdMain which normally stops etcd.

test/integration/scheduler_perf/main_test.go

@@ -17,13 +17,11 @@ 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)
 }