Switch ostestr to 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: Ic580dc7ba0684087a81137771fb125f4d412d948
Signed-off-by: Charles Short <zulcss@gmail.com>

.stestr.conf

@@ -1,3 +1,3 @@
 [DEFAULT]
-test_path=./sahara/tests
+test_path=./sahara/tests/unit
 top_dir=./

lower-constraints.txt

@@ -69,7 +69,6 @@ openstacksdk==0.12.0
 os-api-ref==1.4.0
 os-client-config==1.29.0
 os-service-types==1.2.0
-os-testr==1.0.0
 osc-lib==1.10.0
 oslo.cache==1.29.0
 oslo.concurrency==3.26.0
@@ -143,7 +142,7 @@ sqlalchemy-migrate==0.11.0
 SQLAlchemy==1.0.10
 sqlparse==0.2.4
 statsd==3.2.2
-stestr==2.0.0
+stestr==1.0.0
 stevedore==1.20.0
 Tempita==0.5.2
 tenacity==4.9.0

test-requirements.txt

@@ -12,7 +12,7 @@ doc8>=0.6.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0.0 # BSD
 oslotest>=3.2.0 # Apache-2.0
-os-testr>=1.0.0 # Apache-2.0
+stestr>=1.0.0 # Apache-2.0
 psycopg2>=2.6.2 # LGPL/ZPL
 pylint==1.4.5 # GPLv2
 testresources>=2.0.0 # Apache-2.0/BSD

tox.ini

@@ -12,7 +12,7 @@ setenv =
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
-commands = ostestr {posargs}
+commands = stestr run {posargs}
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:cover]