Switch to using stestr

According to Openstack summit session [1] stestr is
maintained project to which all Openstack projects
should migrate.
Let's switch it then.

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

Change-Id: I745facad3669aa8d737e63c39b3b60cbf34dcafe
Signed-off-by: Charles Short <zulcss@gmail.com>

.gitignore

@@ -26,6 +26,7 @@ pip-log.txt
 .tox
 nosetests.xml
 .testrepository
+.stestr
 .venv
 
 # Translations

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./storyboardclient/tests/
+top_dir=./

test-requirements.txt

@@ -7,7 +7,7 @@ hacking>=0.9.2,<0.10
 coverage>=3.6
 python-subunit
 oslotest>=1.1.0.0a1
-os-testr>=0.4.1
+stestr>=2.0.0
 testrepository>=0.0.18
 testscenarios>=0.4
 testtools>=0.9.34

tox.ini

@@ -10,7 +10,7 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = ostestr '{posargs}'
+commands = stestr run '{posargs}'
 
 [testenv:pep8]
 commands = flake8