Kubernetes Submit Queue 6c23b920b7 Merge pull request #55606 from Lion-Wei/proxier-1 ...

Automatic merge from submit-queue (batch tested with PRs 55606, 59185, 58763, 59072, 59251). 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>.

make ipvs 'cleanupIptablesLeftovers' simplier

Since there are only four iptables chains in ipvs mode, no need to restore all chains when cleanup iptables chain created by ipvs.

**What this PR does / why we need it**:
Make ipvs `cleanupIptablesLeftovers` function much simplier.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #56689 

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```

2018-02-02 18:26:32 -08:00

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