Remove testtools dependency

We actually don't use it anymore. The skip part can be implemented using
unittest.

Change-Id: I8b6fc405332062d294ebc5911f22743a0d326486

aodh/tests/base.py

@@ -17,13 +17,13 @@
 """
 import functools
 import os.path
+import unittest
 
 import oslo_messaging.conffixture
 from oslo_utils import timeutils
 from oslotest import base
 from oslotest import mockpatch
 import six
-from testtools import testcase
 import webtest
 
 import aodh
@@ -90,10 +90,10 @@ def _skip_decorator(func):
         try:
             return func(*args, **kwargs)
         except aodh.NotImplementedError as e:
-            raise testcase.TestSkipped(six.text_type(e))
+            raise unittest.SkipTest(six.text_type(e))
         except webtest.app.AppError as e:
             if 'not implemented' in six.text_type(e):
-                raise testcase.TestSkipped(six.text_type(e))
+                raise unittest.SkipTest(six.text_type(e))
             raise
     return skip_if_not_implemented
 

setup.cfg

@@ -63,7 +63,6 @@ test =
     mock>=1.0
     tempest>=11.0.0  # Apache-2.0
     testrepository>=0.0.18
-    testtools>=1.4.0
     gabbi>=0.12.0 # Apache-2.0
     # Provides subunit-trace
     os-testr