Dont start without device lister

Assert that we correctly started fs factories, meaning we have an available device lister.

This is likely to exhibit the cause for tests failing in #412

changed milestone to %0.11.x

added 3 commits

• 6243a1ff - 1 commit from branch videolan:master
• 89ab987b - FsHolder: Log when a device lister is registered
• 10acb66f - MediaLibrary: Don't ignore fs factories init failures

Compare with previous version

enabled an automatic merge when the pipeline for 10acb66f succeeds

merged