Rename server_connector to uplink

lib/tfw/builtins/message_sender.py

@@ -6,7 +6,7 @@ class MessageSender:
     Provides mechanisms to send messages to our frontend messaging component.
     """
     def __init__(self):
-        self.server_connector = TFWServerUplinkConnector()
+        self.uplink = TFWServerUplinkConnector()
         self.key = 'message'
         self.queue_key = 'queueMessages'
 
@@ -23,7 +23,7 @@ class MessageSender:
                 'message': message
             }
         }
-        self.server_connector.send_message(message)
+        self.uplink.send_message(message)
 
     def queue_messages(self, originator, messages):
         """
@@ -40,7 +40,7 @@ class MessageSender:
                 ]
             }
         }
-        self.server_connector.send_message(message)
+        self.uplink.send_message(message)
 
     @staticmethod
     def generate_messages_from_queue(queue_message):