Remove oslotest from test-requirements

It is not needed and stevedore is a fundamental package which should
try to keep its requirements list small.

Change-Id: I701613977f6c243c13d118d8822fe5db0e12f97e

stevedore/tests/test_callback.py

@@ -32,7 +32,7 @@ class TestCallback(utils.TestCase):
                                         on_load_failure_callback=
                                         failure_callback)
         extensions = list(em.extensions)
-        self.assertThat(len(extensions), GreaterThan(0))
+        self.assertTrue(len(extensions), GreaterThan(0))
         self.assertEqual(len(errors), 2)
         for manager, entrypoint, error in errors:
             self.assertIs(manager, em)

stevedore/tests/utils.py

@@ -10,8 +10,8 @@
 #  License for the specific language governing permissions and limitations
 #  under the License.
 
-from oslotest import base as test_base
+import unittest
 
 
-class TestCase(test_base.BaseTestCase):
+class TestCase(unittest.TestCase):
     pass

test-requirements.txt

@@ -7,6 +7,5 @@ sphinx!=1.6.1,>=1.5.1 # BSD
 mock>=2.0 # BSD
 coverage!=4.4,>=4.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
-oslotest>=1.10.0 # Apache-2.0
 oslosphinx>=4.7.0 # Apache-2.0
 reno>=1.8.0 # Apache-2.0