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: I61dca6dfd7f6227731fdd6902bdd79b5ba0fb995

.gitignore

@@ -13,7 +13,7 @@ dist
 renderspec.egg-info
 ChangeLog
 run_tests.err.log
-.testrepository
+.stestr/
 .tox
 doc/source/api
 doc/build

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./
+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=${OS_TEST_TIMEOUT:-60} \
-             OS_LOG_CAPTURE=${OS_LOG_CAPTURE:-1} \
-             ${PYTHON:-python} -m subunit.run discover -t ./ ./ $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

.zuul.yaml

@@ -4,4 +4,3 @@
       - openstack-python35-jobs
       - openstack-python36-jobs
       - publish-openstack-docs-pti
-      - check-requirements

requirements.txt

@@ -1,8 +1,8 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
-Jinja2!=2.9.0,!=2.9.1,!=2.9.2,!=2.9.3,!=2.9.4,>=2.8 # BSD License (3 clause)
 pymod2pkg!=0.8.0,>=0.7.0 # Apache-2.0
+Jinja2>=2.10 # BSD License (3 clause)
 PyYAML>=3.10 # MIT
 packaging>=16.5 # Apache-2.0
 six>=1.10.0 # MIT

test-requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 flake8>=3.5.0 # MIT
-testrepository>=0.0.18 # Apache-2.0/BSD
+stestr>=2.0.0 # Apache-2.0
 testresources>=2.0.0 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 ddt>=1.0.1 # MIT

tox.ini

@@ -14,7 +14,7 @@ deps =
         -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = python setup.py testr --testr-args='{posargs}'
+commands = stestr run {posargs}
 
 [testenv:pep8]
 commands =