Support db_migrator in Forseti on-GKE

[kevensen]

Blocked By

• Helm Create CloudSQL Proxy container into a Separate Pod #41

Story

In Forseti on-GCE, db_migrator.py is run in the startup script to migrate schema's if necessary. No capability exists in Forseti on-GKE

Proposed Solution

Implement db_migrator.py in an initContainer

Acceptance Criteria

Deploy Forseti on-GKE version 2.22 then Forseti on-GKE version 2.23 (there was a schema change here). The server starts without error. The orchestrator runs without error.