This makes each Test handle its own logfile, allowing the Reporter to
work on multiple tests at the same time.
Patch 5/5 to move logfile handling out of Reporter and into Test.
Instead of saving the current Test in Reporter for every test, use
function parameters to achieve the same goal.
Patch 2/5 to move logfile handling out of Reporter and into Test.
Allow log file redirection through the new --redirect-logs parameter.
Keep the old --logs-dir stdout/stderr parameter, but reset to the
default logs directory in that case, and set redirect_logs internally.
This also prevents the creation of an stdout/stderr directory for
writing xunit.xml.
https://bugzilla.gnome.org/show_bug.cgi?id=742973
