Merge pull request #46512 from thockin/gce-default-to-gci

Automatic merge from submit-queue (batch tested with PRs 46512, 50146)

Default NODE_OS to gci on GCE installs

Looking at https://github.com/kubernetes/test-infra/tree/master/jobs,
any job with "cvm" in the name explicitly sets this variable, so I hope
it is only the default.

**Release note**:
```release-note
Change GCE installs (kube-up.sh) to use GCI/COS for node OS, by default.
```
@mtaufen @dchen1107 @ixdy
This commit is contained in:
Kubernetes Submit Queue 2017-08-19 11:28:13 -07:00 committed by GitHub
commit 43c6c13234

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