Updated source to grab Prometheus and Alerta passwords

Since 2019.2.7 we have pillars on a proxy which store
passwords for some Stacklight UIs

Change-Id: I2ba344ced7f4b945e3b8ff33790252ff59d0cea3
Related-Prod: #PROD-34302(PROD:34302)
diff --git a/test_set/cvp-sanity/utils/__init__.py b/test_set/cvp-sanity/utils/__init__.py
index bcdf01f..c6bbed2 100644
--- a/test_set/cvp-sanity/utils/__init__.py
+++ b/test_set/cvp-sanity/utils/__init__.py
@@ -118,6 +118,10 @@
             if fail_if_empty:
                 raise Exception("No pillar found or it is empty.")
             else:
+                logging.error(
+                    "suppressed incorrect response from pillar_get: {}".format(
+                        response
+                ))
                 return False