Fix logging configuration

Set up a NullHandler to avoid warnings when applications
do not configure a root logger.

Change-Id: I6cd957396c5e3ad706aea812874ab43fdd9e8aea
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>

docs/source/history.rst

@@ -2,6 +2,10 @@
  History
 =========
 
+0.7.1
+
+  - Fix an issue with logging configuration.
+
 0.7
 
   - Add memoization to the entrypoint scanning code in

setup.py

@@ -16,7 +16,7 @@ install_requires = ['distribute',
 
 setup(
     name='stevedore',
-    version='0.7',
+    version='0.7.1',
 
     description='Manage dynamic plugins for Python applications',
     long_description=long_description,

stevedore/__init__.py

@@ -3,3 +3,9 @@ from .enabled import EnabledExtensionManager
 from .named import NamedExtensionManager
 from .hook import HookManager
 from .driver import DriverManager
+
+import logging
+
+# Configure a NullHandler for our log messages in case
+# the app we're used from does not set up logging.
+logging.getLogger(__name__).addHandler(logging.NullHandler())