[2947] Extend lettuce query test config to include broken datasource type

There's no way to comment JSON, so we'll set the type to a very detailed
string.

tests/lettuce/configurations/example.org.inmem.config

@@ -22,6 +22,12 @@
                     "params": {
                         "example.org": "data/example.org"
                     }
+                },
+                {
+                    "type": "broken_libraries_should_be_skipped",
+                    "cache-enable": false,
+                    "params": {
+                    }
                 }
             ]
         }