Add a test.
Add a test.

go9p has a number of races which I will try to fix. I'll also add fixes from my go9p repo, which I intend to remove ASAP. This
go9p is now working so well I can use it.

Signed-off-by: Ronald G. Minnich <f569d0af9a3481c4007b95c7180d6c41009f2513@gmail.com>

lionkov/ninep,edahlgren/go9p