Unexpected keyword argument 'capture_output' while building opt=production

[Michał Cłapiński]

One change (https://review.opencontrail.org/#/c/47786/) introduced code written for newer Python then the one 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:

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/47930
Submitter: Micha? C?api?ski (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/47930
Committed: http://github.com/Juniper/contrail-build/commit/0dc826ac9e01ad71d7568ad878bec3b87b99d175
Submitter: Zuul v3 CI (<email address hidden>)
Branch: master

commit 0dc826ac9e01ad71d7568ad878bec3b87b99d175
Author: Michal Clapinski <email address hidden>
Date: Thu Nov 29 15:22:59 2018 +0100

Downgrade Python code for checking compiler version

That code wasn't working in Python version we have in CI.
This change downgrades the code for older Python versions.

Change-Id: I74328b61aec8fba2fd632a715ddde49ae254f24e
Closes-Bug: #1805850