Doesn't redirect stderr when getting verifier id

The logic fails when rally produces warnings [1].
It also updates Rally OpenStack and checks if the previous error
has been solved[2].

TypeError: _discover_or_create_flavor() missing 1 required positional
argument: 'flv_disk' [3]

[1] https://build.opnfv.org/ci/job/functest-opnfv-functest-healthcheck-latest-tempest_smoke-run/757/console
[2] https://github.com/openstack/rally-openstack/commit/e62315115af20e53f6c7205494ba0008634047ed
[3] https://build.opnfv.org/ci/job/functest-opnfv-functest-healthcheck-latest-tempest_smoke-run/629/console

Change-Id: Ia1daaa76d7cef7f30904c1f3bd42e2f6a6ba10af
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
(cherry picked from commit 62f33836dfb2d24650ec7474d532e304d5d537f6)

1 files changed, 11 insertions, 3 deletions

diff --git a/functest/opnfv_tests/openstack/tempest/tempest.py b/functest/opnfv_tests/openstack/tempest/tempest.py
index 6269540ec..f6b912a60 100644
--- a/functest/opnfv_tests/openstack/tempest/tempest.py
+++ b/functest/opnfv_tests/openstack/tempest/tempest.py
@@ -21,6 +21,7 @@ import subprocess
 import time
 
 import pkg_resources
+import six
 from six.moves import configparser
 from xtesting.core import testcase
 import yaml
@@ -199,9 +200,16 @@ class TempestCommon(singlevm.VmReady2):
         cmd = ("rally verify list-verifiers | awk '/" +
                getattr(config.CONF, 'tempest_verifier_name') +
                "/ {print $2}'")
-        proc = subprocess.Popen(cmd, shell=True,
-                                stdout=subprocess.PIPE,
-                                stderr=subprocess.STDOUT)
+        if six.PY3:
+            # pylint: disable=no-member
+            proc = subprocess.Popen(
+                cmd, shell=True, stdout=subprocess.PIPE,
+                stderr=subprocess.DEVNULL)
+        else:
+            with open(os.devnull, 'wb') as devnull:
+                proc = subprocess.Popen(
+                    cmd, shell=True, stdout=subprocess.PIPE,
+                    stderr=devnull)
         verifier_uuid = proc.stdout.readline().rstrip()
         return verifier_uuid.decode("utf-8")