Upgraded tf version

[swathiswaminathan]

• Made syntax changes to tf files as per tf 0.12 version.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrislovecnm, swathiswaminathan

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/GoogleCloudPlatform/gke-network-policy-demo/blob/master/OWNERS)~~ [chrislovecnm] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment