Automatic merge from submit-queue (batch tested with PRs 45569, 45602, 45604, 45478, 45550)

fix endpoints controller del lead-election endpoints

when there are multiple controller-manager instances,  we observe that it will delete leader-election endpoints after 5min,  and cause re-election, add a check to avoid that

Fixes #45585

error log

```
192.168.0.5 - - [02/May/2017:15:10:13 +0000] "GET /api/v1/endpoints HTTP/1.1" 200 1175 "-" "kube-controller-manager/V100R001C00B012 (linux/amd64) kubernetes/bede5a0/endpoint-controller"
192.168.0.5 - - [02/May/2017:15:10:13 +0000] "DELETE /api/v1/namespaces/kube-system/endpoints/kube-controller-manager HTTP/1.1" 200 46 "-" "kube-controller-manager/V100R001C00B012 (linux/amd64) kubernetes/bede5a0/endpoint-controller"
192.168.0.5 - - [02/May/2017:15:10:13 +0000] "DELETE /api/v1/namespaces/kube-system/endpoints/kube-scheduler HTTP/1.1" 200 46 "-" "kube-controller-manager/V100R001C00B012 (linux/amd64) kubernetes/bede5a0/endpoint-controller"
192.168.0.7 - - [02/May/2017:15:10:14 +0000] "GET /api/v1/namespaces/kube-system/endpoints/kube-scheduler HTTP/1.1" 404 123 "-" "kube-scheduler/V100R001C00B012 (linux/amd64) kubernetes/bede5a0"
192.168.0.7 - - [02/May/2017:15:10:14 +0000] "POST /api/v1/namespaces/kube-system/endpoints HTTP/1.1" 201 398 "-" "kube-scheduler/V100R001C00B012 (linux/amd64) kubernetes/bede5a0"
192.168.0.6 - - [02/May/2017:15:10:14 +0000] "GET /api/v1/namespaces/kube-system/endpoints/kube-controller-manager HTTP/1.1" 404 141 "-" "kube-controller-manager/V100R001C00B012 (linux/amd64) kubernetes/bede5a0"
192.168.0.6 - - [02/May/2017:15:10:14 +0000] "POST /api/v1/namespaces/kube-system/endpoints HTTP/1.1" 201 416 "-" "kube-controller-manager/V100R001C00B012 (linux/amd64) kubernetes/bede5a0"
192.168.0.7 - - [02/May/2017:15:10:14 +0000] "GET /api/v1/namespaces/kube-system/endpoints/kube-controller-manager HTTP/1.1" 200 416 "-" "kube-controller-manager/V100R001C00B012 (linux/amd64) ku
```



release-note

```release-note
none
```