Merge pull request #42830 from apprenda/update_known_flags

Automatic merge from submit-queue

noticed typo in known-flags.txt

**What this PR does / why we need it**: looks like this was a typo that wasn't cleaned up

**Release note**:
```release-note
NONE
```
This commit is contained in:
Kubernetes Submit Queue 2017-04-17 19:04:23 -07:00 committed by GitHub
commit c285328a77

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