[framewqork] use subprocess timeouts

Since Python 3.3, the subprocess module has its own timeout
implementation, so remove the test framework's custom one.
Required a little rejigger since the subprocess timeout is done
on the communicate() call, not set up before the test is started.
Noted that the framework intends to support two levels:
one for the testing class instance, and one for an individual
start call, which should override the one in the instance.

Signed-off-by: Mats Wichmann <mats@linux.com>

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