Please allow --conf for backfill as well

[timstoop]

System information

• Have I written custom code (as opposed to using zenbot vanilla): No
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Docker
• Zenbot version: Master branch
• NodeJS version: node:8
• Python version: N/A
• Exact command to reproduce: zenbot backfill --conf /some/path

Describe the problem

As the conf file contains the mongodb data, I need it for the backfill operation as well. Since I'm running on Kubernetes, I need to put the conf file (which I provide as a ConfigMap) in a dedicated directory, as it will actually mount it there.

Source code / logs

Sun, 07 Jan 2018 20:48:40 GMT node-telegram-bot-api deprecated Automatic enabling of cancellation of promises is deprecated.
In the future, you will have to enable it yourself.
See https://github.com/yagop/node-telegram-bot-api/issues/319. at module.js:643:30

  error: unknown option `--conf'