Fix spawn test failures due to race condition with process exiting early
When a spawned process forks, fails, then exits very quickly, (this typically occurs when exec fails), there is a race condition between the SIGCHLD handler updating the process_handle's fields, and checking the process status in those fields. The update can occur before or after the tests check the process status.
This causes intermittent failures in the test spawn_background_fail(), typically when the machine is under load. I've created a patch that checks whether the process is running or not running (rather than just checking if it is running) to avoid this issue.
I'll submit a github branch once I have the bug number for the changes file name.
tor version: 2.6.0-alpha-dev
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