Fix Rally output retrieval

Read stdout until nothing left instead of stopping once the child
process is terminated.

Change-Id: I46a2eb93fd614e2e7ff676727eb9dc132c29d03f
Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/functest/opnfv_tests/openstack/rally/rally.py b/functest/opnfv_tests/openstack/rally/rally.py
index eefd3eb46..103c3a7e2 100644
--- a/functest/opnfv_tests/openstack/rally/rally.py
+++ b/functest/opnfv_tests/openstack/rally/rally.py
@@ -219,8 +219,7 @@ class RallyBase(testcase.TestCase):
     def get_cmd_output(proc):
         """Get command stdout."""
         result = ""
-        while proc.poll() is None:
-            line = proc.stdout.readline()
+        for line in proc.stdout:
             result += line
         return result
 
@@ -410,8 +409,7 @@ class RallyBase(testcase.TestCase):
         success = 0.0
         nb_totals = 0
 
-        while proc.poll() is None:
-            line = proc.stdout.readline()
+        for line in proc.stdout:
             if ("Load duration" in line or
                     "started" in line or
                     "finished" in line or