Merge pull request #37467 from linyouchong/linyouchong-20161125

Automatic merge from submit-queue

delete unused variable in etcd_help_test.go

**What this PR does / why we need it**:
delete unused variable validEtcdVersion ,for keep the code clean

**Special notes for your reviewer**: none

**Release note**:  none

pkg/storage/etcd/etcd_helper_test.go

@@ -41,8 +41,6 @@ import (
 	storagetesting "k8s.io/kubernetes/pkg/storage/testing"
 )
 
-const validEtcdVersion = "etcd 2.0.9"
-
 func testScheme(t *testing.T) (*runtime.Scheme, runtime.Codec) {
 	scheme := runtime.NewScheme()
 	scheme.Log(t)