Merge pull request #59420 from serathius/enable_hpa_tests_on_large_clusters

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Enable HPA tests on large clusters

Fix https://github.com/kubernetes/kubernetes/issues/55887
After https://github.com/kubernetes/test-infra/pull/6667 was able to run HPA tests 3 times successfully on 2k node cluster.
/cc @shyamjvs @wojtek-t

```release-note

```
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Kubernetes Submit Queue 2018-02-07 09:19:33 -08:00 committed by GitHub
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@ -66,8 +66,7 @@ var _ = SIGDescribe("[HPA] Horizontal pod autoscaling (scale resource: CPU)", fu
})
})
// TODO: Get rid of [DisabledForLargeClusters] tag when issue #54637 is fixed.
SIGDescribe("[DisabledForLargeClusters] ReplicationController light", func() {
SIGDescribe("ReplicationController light", func() {
It("Should scale from 1 pod to 2 pods", func() {
scaleTest := &HPAScaleTest{
initPods: 1,