Switch to use stestr for unit tests directly

This commit switches to use stestr command to run unit tests directly.
Recently, the latest ostestr command uses stestr instead of testr.
However, we should use stestr directly because it's simple and straight
forward. There is no reason to use ostestr for unit tests anymore.

We still have the other ostestr/testr usage such as tempest run command
and documentations. So, that will be changed with following patches.

Change-Id: Iff4abef50178bdc83b868eed4a906e22d790762b

.gitignore

@@ -18,6 +18,7 @@ include/swift_objects/swift_large
 dist
 build
 .testrepository
+.stestr
 .idea
 .project
 .pydevproject

.stestr.conf

@@ -0,0 +1,4 @@
+[DEFAULT]
+test_path=./tempest/test_discover
+group_regex=([^\.]*\.)*
+

requirements.txt

@@ -19,7 +19,7 @@ PyYAML>=3.10 # MIT
 python-subunit>=0.0.18 # Apache-2.0/BSD
 stevedore>=1.20.0 # Apache-2.0
 PrettyTable<0.8,>=0.7.1 # BSD
-os-testr>=0.8.0 # Apache-2.0
+os-testr>=1.0.0 # Apache-2.0
 urllib3>=1.21.1 # MIT
 debtcollector>=1.2.0 # Apache-2.0
 unittest2 # BSD

tempest/tests/test_list_tests.py

@@ -23,12 +23,10 @@ from tempest.tests import base
 
 class TestTestList(base.TestCase):
 
-    def test_testr_list_tests_no_errors(self):
-        # Remove unit test discover path from env to test tempest tests
+    def test_stestr_list_no_errors(self):
         test_env = os.environ.copy()
-        test_env.pop('OS_TEST_PATH')
         import_failures = []
-        p = subprocess.Popen(['testr', 'list-tests'], stdout=subprocess.PIPE,
+        p = subprocess.Popen(['stestr', 'list'], stdout=subprocess.PIPE,
                              env=test_env)
         ids, err = p.communicate()
         self.assertEqual(0, p.returncode,

tox.ini

@@ -16,12 +16,11 @@ deps =
 [testenv]
 setenv =
     VIRTUAL_ENV={envdir}
-    OS_TEST_PATH=./tempest/tests
     OS_LOG_CAPTURE=1
     PYTHONWARNINGS=default::DeprecationWarning
     BRANCH_NAME=master
     CLIENT_NAME=tempest
-passenv = OS_STDOUT_CAPTURE OS_STDERR_CAPTURE OS_TEST_TIMEOUT OS_TEST_LOCK_PATH OS_TEST_PATH TEMPEST_CONFIG TEMPEST_CONFIG_DIR http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY ZUUL_CACHE_DIR REQUIREMENTS_PIP_LOCATION GENERATE_TEMPEST_PLUGIN_LIST
+passenv = OS_STDOUT_CAPTURE OS_STDERR_CAPTURE OS_TEST_TIMEOUT OS_TEST_LOCK_PATH TEMPEST_CONFIG TEMPEST_CONFIG_DIR http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY ZUUL_CACHE_DIR REQUIREMENTS_PIP_LOCATION GENERATE_TEMPEST_PLUGIN_LIST
 usedevelop = True
 install_command =
     {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
@@ -31,7 +30,7 @@ deps =
     -r{toxinidir}/test-requirements.txt
 commands =
     find . -type f -name "*.pyc" -delete
-    ostestr {posargs}
+    stestr --test-path ./tempest/tests run {posargs}
 
 [testenv:genconfig]
 commands = oslo-config-generator --config-file tempest/cmd/config-generator.tempest.conf