Summary:
Eventual plan is to switch to using kustomize to construct YAML files.
Kustomize will be mainlined in Kubectl v1.15.

Test Plan: N/A

Reviewers: oazizi, michelle, #engineering

Reviewed By: oazizi, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D1107

GitOrigin-RevId: 6a93616442dd2c69c0b1ade3de162f1ec344a8d7