Fix log message on exception in setUpClass

This commit fixes an issue with the log messages printed when an
arbitrary exception is raised during setUpClass. Previously the
variables were provided in the wrong order causing the log message
to be confusing.

Change-Id: Ie3682284905f0d31c801aac731ae843fae0fd314
diff --git a/tempest/test.py b/tempest/test.py
index 886e7bb..ff829f3 100644
--- a/tempest/test.py
+++ b/tempest/test.py
@@ -274,8 +274,8 @@
             cls.resource_setup()
         except Exception:
             etype, value, trace = sys.exc_info()
-            LOG.info("%s in %s.setUpClass. Invoking tearDownClass." % (
-                cls.__name__, etype))
+            LOG.info("%s raised in %s.setUpClass. Invoking tearDownClass." % (
+                     etype, cls.__name__))
             cls.tearDownClass()
             try:
                 raise etype, value, trace