environments_all should have a star '*' as an alias for all environments

[roxell]

Today we have a list that may or may not be updated with all the environments...
Which leads to regressions that shouldn't be a regression if the list isn't up to date.

Maybe we can add a star '*', and that can mean all the environments for this project.

https://github.com/Linaro/qa-reports-known-issues/blob/master/ltp-production.yaml#L179