Segregate postgres upgrade instructions on version

The previous instructions always instructed the reader to undo the base image and postgres template in the container configuration. If the upgrade were done from 9.3, that might be confusing as the `base_image` property had never been altered in a previous step.

Author: lbergnehr

templates/postgres.template.yml

@@ -92,7 +92,12 @@ run:
  echo Run "./launcher enter app"
  echo Run "cd /shared/postgres_backup && sudo -u postgres pg_dump discourse > backup.db"
  echo
- echo Undo the base_image and postgres template from your container config
+ if [ "$PG_MAJOR_OLD" = "9.2" ]; then
+ echo Undo the base_image in your container config
+ fi
+ if [ "$PG_MAJOR_OLD" = "9.3" ]; then
+ echo Undo the postgres template in your container config
+ fi
  echo Run: "./launcher stop app"
  echo Run: "sudo mv /var/discourse/shared/standalone/postgres_data /var/discourse/shared/standalone/postgres_data_old"
  echo Run: "./launcher rebuild app"