Save scenario output in a pre-defined folder and exclude folder in gitignore

[Askaholic]

The raider scripts create quite a number of files in various directories which clutter up the git status output and make it hard to find the files that you've edited. This is even true for some of the unit tests, and the test commands in the CI config. It would be a lot better if any commands that were checked into the repo did not create any new untracked files, so that those commands can be used for testing/development without cluttering up the git workspace.

I would suggest adding some sort of generic output directory which the checked in commands write to so we can cover all generated files with a single line in the gitignore.

[dbekaert]

@jlmaurer next we should modify the scenario to output all files in an pre-defined folder which we can exclude in gitignore. Will make pushing of new test code easier. Same for files that get downloaded etc.