Feat/postgres

[viv-4]

• placeos-2.2304.0
• services changed from rethink to postgres connection variables
• rethinkdb removed
• postgres upgraded to postgres-ha
• services configured to connect to pgpool proxy
• simplify staff service postgres connection template - now matches others
• default connection limits set
  • postgres max connections - 500
  • pgpool max init children (max connections from clients) - 500
  • placeos service pods pool size - 10

Deployment tested in GKE

[viv-4]

Rethinkdb based version branched to https://github.com/place-labs/k8s-helm/tree/rethink Prod - https://github.com/place-labs/k8s-helm/tree/rethink-prod