Removed the ability for any handler to use multiple instances by default

Now each handler must implement support for multiple instances in its own
implementation of the instantiate() method

pipeline/handlers/handler.py

@@ -36,22 +36,20 @@ class Handler(QueueThread, metaclass=ABCMeta):
                     tempdir,
                     config):
         """
-        Factory method to create a number of Handler instances based on the
-        count given in the config for a specific handler.
+        Factory method to create a number of Handler instances based on
+        handler-specific configuration.
 
         Only intended to be called on a subclass.
 
-        Returns a list of at least one instance of the Handler in question.
+        This default implementation returns one instance of the Handler in
+        question (wrapped in a list).
         """
-        instances = []
-        for i in range(config.get('count', 1)):
-            instances.append(cls(handlerqueue,
-                                 collector,
-                                 worker,
-                                 ldap,
-                                 tempdir,
-                                 config))
-        return instances
+        return [cls(handlerqueue,
+                    collector,
+                    worker,
+                    ldap,
+                    tempdir,
+                    config)]
 
     def _process(self, queueitem):
         """