* InstanceID integration tests
* ./scripts/style.sh
* Travis: run install_prereqs.sh for IID
* install_prereqs.sh: run `install_secrets` for IID
* Flag to disable IID integration tests
* Travis: IID disable integration tests for forks.
* ./scripts/style.sh
* Temporary disable IID test due to b/147102327
* Travis: IID integration tests enabled for all IID builds.