Switch to stestr

According to Openstack summit session [1] stestr is
maintained project to which all Openstack projects
should migrate.
Let's switch it then.

[1] https://etherpad.openstack.org/p/YVR-python-pti

Change-Id: I430dc5268fb9ef8fcd6e1009f50fb64e32089c37

.gitignore

@@ -28,6 +28,7 @@ setuptools*.egg/
 !/.pylintrc
 !/.stestr.conf
 !/.testr.conf
+.stestr/
 
 # Files created by releasenotes build
 releasenotes/build

.testr.conf

@@ -1,8 +0,0 @@
-[DEFAULT]
-test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
-             OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
-             OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
-             ${PYTHON:-python} -m subunit.run discover -t ./ \
-             ${OS_TEST_PATH:-./neutron_lib/tests/unit} $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

test-requirements.txt

@@ -11,6 +11,7 @@ python-subunit>=1.0.0 # Apache-2.0/BSD
 oslotest>=3.2.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
 reno>=2.5.0  # Apache-2.0
+stestr>=1.0.0 # Apache-2.0
 testresources>=2.0.0 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT

tox.ini

@@ -9,12 +9,15 @@ passenv = TRACE_FAILONLY
 install_command =  pip install {opts} {packages}
 setenv =
   PYTHONWARNINGS=default::DeprecationWarning
+  OS_LOG_CAPTURE={env:OS_LOG_CAPTURE:true}
+  OS_STDOUT_CAPTURE={env:OS_STDOUT_CAPTURE:true}
+  OS_STDERR_CAPTURE={env:OS_STDERR_CAPTURE:true}
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands =
-  ostestr --regex '{posargs}'
+  stestr run {posargs}
 
 [testenv:pep8]
 commands =
@@ -32,9 +35,14 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 commands = {posargs}
 
 [testenv:cover]
+setenv =
+  {[testenv]setenv}
+  PYTHON=coverage run --source neutron_lib --parallel-mode
 commands =
-  python setup.py test --coverage --coverage-package-name=neutron_lib --testr-args='{posargs}'
-  coverage report
+  stestr run --no-subunit-trace {posargs}
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
 
 [testenv:docs]
 deps =