Use notify on ready under systemd instead of hack with sleep + check commandline
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=17270)
</details>
<!--IssueSummary end-->
Just forwarding the feature request originally filed against the debian package https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=846179
cc @balasankarc @stanhu
issue