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: I7079a92f972f5cb21e0d2077dd029701930a3590

.gitignore

@@ -16,7 +16,7 @@ doc/build
 heatclient/versioninfo
 *.egg-info
 *.log
-.testrepository
+.stestr/
 
 # Files created by releasenotes build
 releasenotes/build

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=${OS_TEST_PATH:-./heatclient/tests/unit}
+top_dir=./

.testr.conf

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

lower-constraints.txt

@@ -85,10 +85,9 @@ six==1.10.0
 snowballstemmer==1.2.1
 Sphinx==1.6.2
 sphinxcontrib-websupport==1.0.1
-stestr==1.0.0
+stestr==2.0.0
 stevedore==1.20.0
 tempest==17.1.0
-testrepository==0.0.18
 testscenarios==0.4
 testtools==2.2.0
 traceback2==1.4.0

test-requirements.txt

@@ -10,7 +10,7 @@ requests-mock>=1.2.0 # Apache-2.0
 mock>=2.0.0 # BSD
 mox3>=0.20.0 # Apache-2.0
 python-openstackclient>=3.12.0 # Apache-2.0
+stestr>=2.0.0 # Apache-2.0
 tempest>=17.1.0 # Apache-2.0
-testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT

tox.ini

@@ -13,7 +13,7 @@ deps =
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = find . -type f -name "*.py[c|o]" -delete
-           python setup.py testr --slowest --testr-args='{posargs}'
+           stestr run --slowest {posargs}
 whitelist_externals = find
 
 [testenv:debug]
@@ -45,8 +45,13 @@ passenv = OS_*
 
 [testenv:cover]
 basepython = python3
+setenv =
+    PYTHON=coverage run --source heatclient --parallel-mode
 commands =
-    python setup.py testr --coverage --testr-args='{posargs}'
+    stestr run '{posargs}'
+    coverage combine
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
     coverage report
 
 [testenv:docs]