Remove old 2015 schema topic

Author: ecfan

.openpublishing.redirection.json

@@ -7372,6 +7372,11 @@
       "redirect_url": "/azure/logic-apps/logic-apps-using-sap-connector",
       "redirect_document_id": true
     },
+    {
+      "source_path": "articles/logic-apps/logic-apps-schema-2015-08-01.md",
+      "redirect_url": "/azure/logic-apps/logic-apps-schema-2016-04-01",
+      "redirect_document_id": true
+    },
     {
       "source_path": "articles/scheduler/get-started-portal.md",
       "redirect_url": "/azure/scheduler/migrate-from-scheduler-to-logic-apps"