Disable displaying warnings in functional tests

Because of known issue with stestr running on Python 3,
that too much output on stdout/stderr cause some subunit.parser
errors, we need to avoid displaying python warnings during
functional tests.

Change-Id: I1a80f62542c68fe891e445920dc89a63efef9175

neutron/tests/functional/base.py

@@ -14,6 +14,7 @@
 #    under the License.
 
 import os
+import warnings
 
 from oslo_config import cfg
 
@@ -31,6 +32,10 @@ DEFAULT_LOG_DIR = os.path.join(helpers.get_test_log_path(),
 class BaseLoggingTestCase(base.BaseTestCase):
     def setUp(self):
         super(BaseLoggingTestCase, self).setUp()
+        # NOTE(slaweq): Because of issue with stestr and Python3, we need
+        # to avoid too much output to be produced during tests, so we will
+        # ignore python warnings here
+        warnings.simplefilter("ignore")
         base.setup_test_logging(
             cfg.CONF, DEFAULT_LOG_DIR, "%s.txt" % self.id())
 

tox.ini

@@ -49,6 +49,9 @@ setenv = {[testenv]setenv}
          {[testenv:common]setenv}
          OS_TEST_PATH=./neutron/tests/functional
          OS_LOG_PATH={env:OS_LOG_PATH:/opt/stack/logs}
+# Because of issue with stestr and Python3, we need to avoid too much output
+# to be produced during tests, so we will ignore python warnings here
+         PYTHONWARNINGS=ignore
 deps =
   {[testenv]deps}
   -r{toxinidir}/neutron/tests/functional/requirements.txt