bpo-38323: Remove test_cancel_make_subprocess_transport_exec as it has a rance condicion

[pablogsal]

…

https://bugs.python.org/issue38323

[pablogsal]

Turns out this is not enough:

./python -u -m test test_asyncio -m SubprocessMultiLoopWatcherTests -F --timeout=10.0 -j20
...
  File "/home/pablogsal/github/cpython/Lib/unittest/case.py", line 592 in run
  File "/home/pablogsal/github/cpython/Lib/unittest/case.py", line 652 in __call__
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 122 in run
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 122 in run
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 122 in run
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 122 in run
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 122 in run
  File "/home/pablogsal/github/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/home/pablogsal/github/cpython/Lib/test/support/testresult.py", line 169 in run
  File "/home/pablogsal/github/cpython/Lib/test/support/__init__.py", line 960 in _run_suite
  File "/home/pablogsal/github/cpython/Lib/test/support/__init__.py", line 1083 in run_unittest
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/runtest.py", line 210 in _test_module
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/runtest.py", line 246 in _runtest_inner2
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/runtest.py", line 282 in _runtest_inner
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/runtest.py", line 154 in _runtest
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/runtest.py", line 194 in runtest
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/runtest_mp.py", line 81 in run_tests_worker
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/main.py", line 661 in _main
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/main.py", line 641 in main
  File "/home/pablogsal/github/cpython/Lib/test/libregrtest/main.py", line 719 in main
  File "/home/pablogsal/github/cpython/Lib/test/regrtest.py", line 43 in _main
  File "/home/pablogsal/github/cpython/Lib/test/regrtest.py", line 47 in <module>
  File "/home/pablogsal/github/cpython/Lib/runpy.py", line 86 in _run_code
  File "/home/pablogsal/github/cpython/Lib/runpy.py", line 196 in _run_module_as_main
Kill <TestWorkerProcess #1 running test=test_asyncio pid=30022 time=950 ms> process group
Kill <TestWorkerProcess #2 running test=test_asyncio pid=30093 time=679 ms> process group
Kill <TestWorkerProcess #3 running test=test_asyncio pid=29847 time=1.6 sec> process group
Kill <TestWorkerProcess #4 running test=test_asyncio pid=29757 time=1.9 sec> process group
Kill <TestWorkerProcess #5 running test=test_asyncio pid=29922 time=1.3 sec> process group
Kill <TestWorkerProcess #6 running test=test_asyncio pid=29859 time=1.5 sec> process group
Kill <TestWorkerProcess #7 running test=test_asyncio pid=30146 time=362 ms> process group
Kill <TestWorkerProcess #8 running test=test_asyncio pid=29880 time=1.4 sec> process group
Kill <TestWorkerProcess #9 running test=test_asyncio pid=30028 time=934 ms> process group
Kill <TestWorkerProcess #10 running test=test_asyncio pid=29968 time=1.2 sec> process group
Kill <TestWorkerProcess #11 running test=test_asyncio pid=30000 time=1.0 sec> process group
Kill <TestWorkerProcess #12 running test=test_asyncio pid=29765 time=1.9 sec> process group
Kill <TestWorkerProcess #13 running test=test_asyncio pid=30183 time=112 ms> process group
Kill <TestWorkerProcess #14 running test=test_asyncio pid=30161 time=234 ms> process group
Kill <TestWorkerProcess #15 running test=test_asyncio pid=29888 time=1.4 sec> process group
Kill <TestWorkerProcess #16 running test=test_asyncio pid=29743 time=2.0 sec> process group
Kill <TestWorkerProcess #18 running test=test_asyncio pid=30101 time=548 ms> process group
Kill <TestWorkerProcess #19 running test=test_asyncio pid=29885 time=1.4 sec> process group
Kill <TestWorkerProcess #20 running test=test_asyncio pid=29762 time=1.9 sec> process group

== Tests result: FAILURE ==

565 tests OK.

1 test failed:
    test_asyncio

Total duration: 1 min 1 sec

[cjerdonek]

Also, @pablogsal, you don't want to remove the methods because that removes the test for every subclass. You just want to skip the concrete SubprocessMultiLoopWatcherTests.