launcher hide flag hides too much info (especially in user.* plugin jobs)

[Sylvain Pineau]

The ouput ui option can be set to hide which means all stdout/sderr are never displayed when running a job command. The Manisfest job was the first to stop working with this type of restrictions and we solved it by ignoring the hide option when checked-io flag was on for a job.

But that's not enough as any script in a user-interact/verify job can trigger a question and wait for user input.

So the hide option should only act as hide-resource-and-attachment-and-shell where there's no interaction with the user.

I'm opening this bug as tests such as the sd card insertion/removal tests usually output precious info that are not visible if the hide option is activated.

[1] http://checkbox.readthedocs.io/en/latest/launcher-tutorial.html#user-interface-section