Fixes to FlappCommand and its tests.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>
Remove unneeded 'tee' functionality from LoggingTeeStream.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>
Append success/failure record to signups.csv in automation server.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>