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: Iee13deb54056e1c81d3732cb51a61c68481607fa

.gitignore

@@ -8,7 +8,7 @@ build
 cover
 htmlcov
 .secret_key_store
-.testrepository
+.stestr/
 .venv
 dist
 *.egg

.stestr.conf

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

.testr.conf

@@ -1,4 +0,0 @@
-[DEFAULT]
-test_command=${PYTHON:-python} -m subunit.run discover -t ./ ./cloudkittydashboard/tests $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

test-requirements.txt

@@ -9,7 +9,7 @@ python-subunit>=0.0.18
 sphinx>=1.6.2 # BSD
 openstackdocstheme>=1.11.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0
-testrepository>=0.0.18
+stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4
 testtools>=1.4.0
 reno>=1.8.0  # Apache2

tox.ini

@@ -10,7 +10,7 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = python setup.py testr --slowest --testr-args='{posargs}'
+commands = stestr run --slowest {posargs}
 
 [testenv:pep8]
 commands = flake8
@@ -19,7 +19,14 @@ commands = flake8
 commands = {posargs}
 
 [testenv:cover]
-commands = python setup.py testr --coverage --testr-args='{posargs}'
+setenv =
+    {[testenv]setenv}
+    PYTHON=coverage run --source cloudkittydashboard --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