Merge "Do not generate bytecode in tests"

tox.ini

@@ -11,6 +11,7 @@ setenv =
   OS_STDOUT_CAPTURE=1
   OS_STDERR_CAPTURE=1
   OS_TEST_TIMEOUT=300
+  PYTHONDONTWRITEBYTECODE=1
 constraints =
   {env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
 extras =
@@ -49,6 +50,7 @@ setenv =
   {[testenv]setenv}
   PYTHON=coverage run --source zaqar --parallel-mode
 commands =
+  coverage erase
   {[testenv]commands}
   coverage combine
   coverage html -d cover