Add debug logging to unit test base class

Sometimes tests run long and it's hard to figure out which operation
wasn't mocked out. Enabling debug logging before the logging fixture
means that the debug logging is produced, but is still shoved into the
fixture. If you run a test via testtools.run or something similar,
you'll see both the operations and any print statements, but running
normally under testr it's all silent.

Change-Id: I38de01f6fdb57274eef93100d885f7a062e7167a

shade/tests/base.py

@@ -20,6 +20,8 @@ import os
 import fixtures
 import testtools
 
+import shade
+
 _TRUE_VALUES = ('true', '1', 'yes')
 
 
@@ -50,4 +52,5 @@ class TestCase(testtools.TestCase):
             stderr = self.useFixture(fixtures.StringStream('stderr')).stream
             self.useFixture(fixtures.MonkeyPatch('sys.stderr', stderr))
 
+        shade.simple_logging(debug=True)
         self.log_fixture = self.useFixture(fixtures.FakeLogger())