Mitchell Hashimoto 87767e24d0 Fix test harness where blocking could occur on IO read.
We had issues with the CI where some tests would sometimes hang
on cleanup when it would call VBoxManage, even with a timeout.
My only assumption is that this is happening as it waits on `readline`,
so we do a `read_nonblock` which will help immensely.
2011-11-24 14:13:22 -07:00
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