[issue30764] regrtest: Add --fail-env-changed option

[STINNER Victor]

STINNER Victor added the comment:

Test failure on x86-64 Sierra 2.7 buildbot:

http://buildbot.python.org/all/builders/x86-64%20Sierra%202.7/builds/111/steps/test/logs/stdio

test_shell_string_with_spaces (test.test_subprocess.CommandsWithSpaces) ... test test_subprocess failed -- Traceback (most recent call last):
  File "/Users/buildbot/buildarea/2.7.billenstein-sierra/build/Lib/test/test_subprocess.py", line 1302, in test_child_terminated_in_stopped_state
    self.assertLess(returncode, 0)  # signal death, likely SIGSEGV.
AssertionError: 1 not less than 0

skipped 'mswindows only'

======================================================================
FAIL: test_child_terminated_in_stopped_state (test.test_subprocess.POSIXProcessTestCase)
Test wait() behavior when waitpid returns WIFSTOPPED; issue29335.
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Traceback (most recent call last):
  File "/Users/buildbot/buildarea/2.7.billenstein-sierra/build/Lib/test/test_subprocess.py", line 1302, in test_child_terminated_in_stopped_state
    self.assertLess(returncode, 0)  # signal death, likely SIGSEGV.
AssertionError: 1 not less than 0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30764>
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