Merge pull request #67549 from yliaog/istio

Automatic merge from submit-queue (batch tested with PRs 60790, 66023, 67549). 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>.

Removed istio related addon manifests, as the directory is deprecated.

**What this PR does / why we need it**:
the cluster/addon directory is deprecated, hence removing istio related addon manifests underneath.

**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 #

**Special notes for your reviewer**:

**Release note**:

```release-note
None
```
pull/8/head
Kubernetes Submit Queue 2018-08-17 20:37:01 -07:00 committed by GitHub
commit b44a768052
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