Wire postgres credentials into SOC module config

- Create vars/postgres.map.jinja for postgres auth globals
- Add POSTGRES_GLOBALS to all manager-type role vars
  (manager, eval, standalone, managersearch, import)
- Add postgres module config to soc/defaults.yaml
- Inject so_postgres credentials from auth pillar into
  soc/defaults.map.jinja (conditional on auth pillar existing)

salt/soc/defaults.yaml

@@ -1491,6 +1491,14 @@ soc:
           org: Security Onion
           bucket: telegraf/so_short_term
           verifyCert: false
+        postgres:
+          hostUrl: so-postgres
+          port: 5432
+          username:
+          password:
+          dbname: securityonion
+          sslMode: require
+          assistantEnabled: true
         playbook:
           autoUpdateEnabled: true
           playbookImportFrequencySeconds: 86400