Automatic merge from submit-queue (batch tested with PRs 38432, 36887, 38415)

Bump Container VM to latest version

- Enables kernel softlockup detection (for https://github.com/kubernetes/kubernetes/issues/37853)
- Removes iSCSI support

```release-note
Bump GCE debian image to container-vm-v20161208 ([release notes](https://cloud.google.com/compute/docs/containers/container_vms#changelog))
```