Conditionally runs the tests depending on the availability of Python
versions (because Travis is the worst).

Clean up anything that failed

The issue remains that we don't test our tools, but at least we test
that they compile.

Especially useful in combination with -f.

Allows run_tests to early out as soon as a test fails.
Plays well with -f.

Allows run_tests to early out as soon as a test fails.
Plays well with -f.

These are processes consume CPU for the purpose of slowing down tests, allowing more timing related issues to be exposed.

Trying to make all bugs become clearer

This avoids all tests showing up as run_python.sh.

-) Properly setting up the endpoint pair.
-) Beancounting on socket shutdown to properly add references.
-) Only proceed to clear out data when called from the IOCP thread.
-) Enabling ALL the tests.
-) Fixing run_tests.py to properly invoke them.