added a few entries to fake config; added set method to fake client

fake.py

@@ -32,7 +32,9 @@ data = {
         "x": None,
         "y": [1,2,3],
         "aaa": "aaa",
-        "c": "cccccc"
+        "c": "cccccc",
+        "image_background_enable": "passive",
+        "function": "spectrometer.py"
     },
 
     "ignored": {}
@@ -51,6 +53,8 @@ class PipelineClient:
         return server_info
     def get_instance_config(self, name):
         return data[name]
+    def set_instance_config(self, name, config):
+        pass
     def get_pipelines(self):
         return data.keys()