Comment 7 for bug 5814

After discussion with Steve, it would be beneficial to track the time spent tests with external dependencies like Soyuz or the libraries we use for bzr imports like cscvs.

It might be possible to group those tests in a new layer. Otherwise, probably define a test tag system.

I'll see if grouping these tests using a layer is possible, otherwise, I'll open a new bug about the 'tag' proposal.