Default commit message doesn't follow best practices

When we commit a change via GitLab UI, the default commit message is just two words.

This makes dangerbot complain about that. That's annoying when doing quick changes to the gitlab-ce codebase.

The only way I found to solve it is to change the commit message (e.g. via git rebase), but this cannot be done from the GitLab UI and then I need to set up a local environment to do that.

We should consider to either change our dangerbot rules, or the default commit message.