Switch to use stestr for unit test

According to Openstack summit session [1],
stestr is maintained project to which all Openstack projects should migrate.
So we should switch to stestr.

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

Change-Id: Ib10e4f3ac8344f5129ce355c093e567fb2b1eba0

.gitignore

@@ -26,7 +26,7 @@ pip-log.txt
 .coverage
 .tox
 nosetests.xml
-.testrepository
+.stestr/
 .venv
 
 # Translations

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./aodhclient/tests
+top_dir=./

.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 ./ ${OS_TEST_PATH:-./aodhclient/tests} $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

setup.cfg

@@ -28,7 +28,7 @@ test =
     oslotest>=1.10.0 # Apache-2.0
     reno>=1.6.2 # Apache2
     tempest>=10
-    testrepository>=0.0.18
+    stestr>=2.0.0 # Apache-2.0
     testtools>=1.4.0
     pifpaf[gnocchi]>=0.23
     gnocchi[postgresql,file]

tox.ini

@@ -16,7 +16,7 @@ passenv = GNOCCHI_* AODH_* OS_TEST_TIMEOUT OS_STDOUT_CAPTURE OS_STDERR_CAPTURE O
 deps =
     .[test]
     http://tarballs.openstack.org/aodh/aodh-master.tar.gz#egg=aodh[mysql]
-commands = pifpaf run aodh -- python setup.py test --slowest --testr-args='{posargs}'
+commands = pifpaf run aodh -- stestr run --slowest {posargs}
 
 [testenv:pep8]
 basepython = python3
@@ -31,8 +31,14 @@ commands = {posargs}
 
 [testenv:cover]
 basepython = python3
+setenv =
+    {[testenv]setenv}
+    PYTHON=coverage run --source aodhclient --parallel-mode
 commands =
-   python setup.py test --coverage --testr-args='{posargs}'
+   stestr run {posargs}
+   coverage combine
+   coverage html -d cover
+   coverage xml -o cover/coverage.xml
    coverage report
 
 [testenv:releasenotes]