caddy-frontend/test: Store snapshots on setUpClass failure

software/caddy-frontend/test/test.py

@@ -559,6 +559,7 @@ class SlaveHttpFrontendTestCase(SlapOSInstanceTestCase):
       cls.waitForCaddy()
     except BaseException:
       cls.logger.exception("Error during setUpClass")
+      cls._storeSnapshot("{}.setUpClass".format(cls.__name__))
       cls._cleanup()
       cls.setUp = lambda self: self.fail('Setup Class failed.')
       raise