Upgrade to Stretch 9.3

Stretch 9.3 will be released on December 9th and Linux 4.14 should be uploaded to sid late November. If either one brings interesting updates, we should consider bumping our APT snapshots. We’ll have 1.5 months to do QA so it does not seem crazy. We have tools and processes to do either one of these updates independently from each other, but by default they go together so let’s first handle them as one. We did such an update for 3.3 (bugfix release as well) and it went fine AFAIK, e.g. the Linux 4.13 update fixed some hardware support and I was not reported any regression.

Feature Branch: feature/14999-Stretch-9.3

Related issues

• Related to #14786 (closed)
• Blocks #13244 (closed)
• Blocks #14976 (closed)

Original created by @intrigeri on 14999 (Redmine)