Emit some nodepool stats

Change-Id: I7bc3914e8b8d64afee061c002dcc9cca5dd1ef4d
diff --git a/tests/unit/test_nodepool.py b/tests/unit/test_nodepool.py
index d51898b..d3f9ddb 100644
--- a/tests/unit/test_nodepool.py
+++ b/tests/unit/test_nodepool.py
@@ -29,6 +29,7 @@
     def setUp(self):
         super(TestNodepool, self).setUp()
 
+        self.statsd = None
         self.zk_chroot_fixture = self.useFixture(
             ChrootedKazooFixture(self.id()))
         self.zk_config = '%s:%s%s' % (