Add .stestr.conf configuration

os-testr has moved over to use stestr instead of testr. While this
is usually compaible with existing settings, there is a warning
that is emitted when .stestr.conf is not present. It is usually
able to fall back to parsing the .testr.conf file, but to be more
correct and to prevent future problems we should update the config.

Change-Id: I11e43cff87cad20b9c880e276e20a04123f830fb

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=${OS_TEST_PATH:-./cinder/tests/unit}
+top_dir=./

.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:-./cinder/tests/unit}  $LISTOPT $IDOPTION
-
-test_id_option=--load-list $IDFILE
-test_list_option=--list

tox.ini

@@ -9,6 +9,10 @@ envlist = py35,py27,compliance,pep8
 setenv = VIRTUAL_ENV={envdir}
          PYTHONHASHSEED=0
          PYTHONWARNINGS=default::DeprecationWarning
+         OS_STDOUT_CAPTURE=1
+         OS_STDERR_CAPTURE=1
+         OS_TEST_TIMEOUT=60
+         OS_TEST_PATH=./cinder/tests/unit
 usedevelop = True
 install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 
@@ -73,10 +77,14 @@ commands = bash tools/lintstack.sh
 [testenv:cover]
 # Also do not run test_coverage_ext tests while gathering coverage as those
 # tests conflict with coverage.
+setenv =
+    {[testenv]setenv}
+    PYTHON=coverage run --source cinder --parallel-mode
 commands =
-  python setup.py testr --coverage \
-    --testr-args='^(?!.*test.*coverage).*$'
-  coverage report
+    stestr run {posargs}
+    coverage combine
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
 
 [testenv:genconfig]
 sitepackages = False