Switch to using stestr

When the TC merged I2637dd714cbb6d38ef8b8dc1083e359207118284 we're
supposed to invoke stestr rather than testr so lets do that

Change-Id: I219b3c448aae6df010cdccced1b9072dc6db0729

.gitignore

@@ -28,6 +28,7 @@ cover/
 .tox
 nosetests.xml
 .testrepository
+.stestr/
 .venv
 
 # Translations

.stestr.conf

@@ -0,0 +1,4 @@
+[DEFAULT]
+test_path=./mistral_lib/tests
+top_path=./
+

.testr.conf

@@ -1,7 +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 ./ . $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

lower-constraints.txt

@@ -44,6 +44,7 @@ six==1.10.0
 snowballstemmer==1.2.1
 Sphinx==1.6.2
 sphinxcontrib-websupport==1.0.1
+stestr==2.0.0
 stevedore==1.20.0
 testrepository==0.0.18
 testtools==2.2.0

test-requirements.txt

@@ -7,7 +7,7 @@ coverage!=4.4,>=4.0 # Apache-2.0
 sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
 openstackdocstheme>=1.18.1 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
-testrepository>=0.0.18 # Apache-2.0/BSD
+stestr>=2.0.0 # Apache-2.0
 
 # releasenotes
 reno>=2.5.0 # Apache-2.0

tox.ini

@@ -16,7 +16,7 @@ deps =
   -r{toxinidir}/requirements.txt
 commands =
   find . -type f -name "*.pyc" -delete
-  python setup.py testr --slowest --testr-args='{posargs}'
+  stestr run --slowest {posargs}
 whitelist_externals =
   rm
   find
@@ -28,7 +28,13 @@ commands = flake8 {posargs}
 commands = {posargs}
 
 [testenv:cover]
-commands = python setup.py test --coverage --coverage-package-name=mistral_lib --testr-args='{posargs}'
+setenv =
+    PYTHON=coverage run --source $project --parallel-mode
+commands =
+    stestr run '{posargs}'
+    coverage combine
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
 
 [testenv:docs]
 commands = python setup.py build_sphinx