Test with both vanilla and eventlet stdlib

We intend this project's code to function both with and without
eventlet monkey patching, so we should test that way too.  This adds
a separate test run that explicitly enables eventlet and removes
the racy monkey patching that existed before.

I left the eventlet-specific unit test because it's making direct
calls into eventlet, so it is a somewhat different case from
implicitly using monkey patched classes and I'd rather leave a
redundant test than remove it and find out it covered something
the others don't.

Change-Id: Idbe9cdd90e9ce5e38b03ec1c20066928daa9ef00
Closes-Bug: 1367966

tests/__init__.py

@@ -0,0 +1,19 @@
+#    Copyright 2014 Red Hat, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import os
+
+if os.environ.get('TEST_EVENTLET'):
+    import eventlet
+    eventlet.monkey_patch()

tests/unit/test_lockutils_eventlet.py

@@ -17,7 +17,6 @@ import shutil
 import tempfile
 
 import eventlet
-eventlet.monkey_patch()
 from eventlet import greenpool
 from oslotest import base as test_base
 

tox.ini

@@ -14,8 +14,10 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
+# We want to support both vanilla stdlib and eventlet monkey patched
 commands =
     lockutils-wrapper python setup.py testr --slowest --testr-args='{posargs}'
+    env TEST_EVENTLET=1 lockutils-wrapper python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:py33]
 deps = -r{toxinidir}/requirements-py3.txt