Comment 0 for bug 1805850

One change (https://review.opencontrail.org/#/c/47786/) introduced code written for newer Python then the on we have in CI causing errors while building optimized code.

Logs:
05:12:44 [Build] TypeError: __init__() got an unexpected keyword argument 'capture_output':
05:12:44 [Build] File "J:\Jenkins\workspace\WinContrail\test-build-containers-pm\SConstruct", line 14:
05:12:44 [Build] env = rules.SetupBuildEnvironment(conf)
05:12:44 [Build] File "tools/build\rules.py", line 1242:
05:12:44 [Build] env = CheckBuildConfiguration(conf)
05:12:44 [Build] File "tools/build\rules.py", line 1024:
05:12:44 [Build] if not VerifyClVersion():
05:12:44 [Build] File "tools/build\rules.py", line 1040:
05:12:44 [Build] process = subprocess.run(['cl.exe'], capture_output=True, encoding='ASCII')
05:12:44 [Build] File "C:\Python36\lib\subprocess.py", line 403:
05:12:44 [Build] with Popen(*popenargs, **kwargs) as process: