[2133] Don't use defaults in lettuce

Because the defaults include references to files in install directory
and lettuce breaks when the files are not yet installed. This should fix
bug #2159 as well.

tests/lettuce/configurations/bindctl/bindctl.config.orig

@@ -14,6 +14,9 @@
             "address": "127.0.0.1"
         } ]
     },
+    "data_sources": {
+        "classes": {}
+    },
     "Boss": {
         "components": {
             "b10-cmdctl": { "special": "cmdctl", "kind": "needed" }

tests/lettuce/configurations/bindctl_commands.config.orig

@@ -14,6 +14,9 @@
             "address": "127.0.0.1"
         } ]
     },
+    "data_sources": {
+        "classes": {}
+    },
     "StatsHttpd": {
         "listen_on": [ {
             "port": 47811,