[GCE] gsutil update fails in newer images, use gcloud

    googlecompute: It looks like you are trying to run "/usr/local/bin/../share/google/google-cloud-sdk/bin/bootstrapping/gsutil.py update".
    googlecompute: The "update" command is no longer needed with the Cloud SDK.
    googlecompute: To update, run: gcloud components update
Merge pull request #1292 from maestrodev/gcloud

[GCE] google compute builder is broken, gsutil update fails in newer images