server/web2py/applications/vidjil/tests/functional/: add close_everything

Unfortunately Ryan did a nice job not to prevent this. But our test
architecture is probably slightly underoptimal and the close_everything
was called many times with ObjectSpace.define_finalizer (once by test)
which is not possible anymore when printing the console
27 jobs for feature-sc/refactor-browser-test in 68 minutes and 1 second (queued for 2 seconds)