Ensures testtools 0.9.32

It includes a fix for a typo around the unittest2 skipTest
exeption import, see testtools revision 366, which is useful to
SKIP correctly on py26

Change-Id: Ice4dd9f79aaac8678d85dc393632cf5752d253f7
diff --git a/requirements.txt b/requirements.txt
index 19d6e0b..df9951d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 anyjson
 nose
 httplib2>=0.7.0
-testtools>=0.9.29
+testtools>=0.9.32
 lxml
 boto>=2.2.1
 paramiko