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: If306e0fdf7a63d800524240c77eebcc4f26d129c

.gitignore

@@ -27,7 +27,7 @@ cover/
 !.coveragerc
 .tox
 nosetests.xml
-.testrepository
+.stestr/
 .venv
 
 # Translations
@@ -55,4 +55,4 @@ ChangeLog
 .*sw?
 
 # Files created by releasenotes build
-releasenotes/build
+releasenotes/build

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./sushy_tools/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 ./ . $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

lower-constraints.txt

@@ -45,7 +45,7 @@ snowballstemmer==1.2.1
 Sphinx==1.6.2
 sphinxcontrib-websupport==1.0.1
 stevedore==1.20.0
-testrepository==0.0.18
+stestr==1.0.0
 testscenarios==0.4
 testtools==2.2.0
 traceback2==1.4.0

test-requirements.txt

@@ -9,6 +9,6 @@ python-subunit>=1.0.0 # Apache-2.0/BSD
 sphinx!=1.6.6,>=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>=1.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT

tox.ini

@@ -12,7 +12,8 @@ setenv =
 deps =
     -r{toxinidir}/test-requirements.txt
     -r{toxinidir}/requirements.txt
-commands = python setup.py test --slowest --testr-args='{posargs}'
+commands = stestr run {posargs}
+           stestr slowest
 
 [testenv:pep8]
 basepython = python3
@@ -24,7 +25,14 @@ commands = {posargs}
 
 [testenv:cover]
 basepython = python3
-commands = python setup.py test --coverage --testr-args='{posargs}'
+setenv =
+   {[testenv]setenv}
+   PYTHON=coverage run --source sushy_tools --parallel-mode
+commands =
+   stestr run {posargs}
+   coverage combine
+   coverage html -d cover
+   coverage xml -o cover/coverage.xml
 
 [testenv:docs]
 basepython = python3