Switch to stestr

According to Openstack summit session [1], stestr is maintained project
to which all Openstack projects should migrate. Let's switch to stestr
as other projects have already moved to it.

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

Change-Id: I02e33d429154936db9ca65b4fd04cfa10754507b

.gitignore

@@ -3,7 +3,7 @@ build/
 *.pyc
 *.swp
 .venv
-.testrepository
+.stestr/
 .tox
 
 # pbr-generated stuff

.stestr.conf

@@ -0,0 +1,4 @@
+[DEFAULT]
+test_path=./os_traits/tests
+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:-./os_traits/tests}  $LISTOPT $IDOPTION
-
-test_id_option=--load-list $IDFILE
-test_list_option=--list

test-requirements.txt

@@ -7,6 +7,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
 oslotest>=3.2.0 # Apache-2.0
-testrepository>=0.0.18 # Apache-2.0/BSD
+stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT

tox.ini

@@ -9,7 +9,7 @@ whitelist_externals =
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/test-requirements.txt
-commands = python setup.py testr --slowest --testr-args='{posargs}'
+commands = stestr run --slowest {posargs}
 
 [testenv:pep8]
 commands = flake8 {posargs}
@@ -17,9 +17,6 @@ commands = flake8 {posargs}
 [testenv:venv]
 commands = {posargs}
 
-[testenv:cover]
-commands = python setup.py test --coverage --testr-args='{posargs}'
-
 [testenv:docs]
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}