Fix the uses of stanza.reply()

This is relying on the stanzas being copied for each handler. We no
longer do that for performance reasons, so instead of editing the copy
in-place, stanza.reply() now returns a new stanza.

slixmpp/plugins/xep_0323/sensordata.py

@@ -303,11 +303,11 @@ class XEP_0323(BasePlugin):
 
             #print("added session: " + str(self.sessions))
 
-            iq.reply()
+            iq = iq.reply()
             iq['accepted']['seqnr'] = seqnr
             if not request_delay_sec is None:
                 iq['accepted']['queued'] = "true"
-            iq.send(block=False)
+            iq.send()
 
             self.sessions[session]["node_list"] = process_nodes
 
@@ -327,11 +327,11 @@ class XEP_0323(BasePlugin):
                 self._threaded_node_request(session, process_fields, req_flags)
 
         else:
-            iq.reply()
+            iq = iq.reply()
             iq['type'] = 'error'
             iq['rejected']['seqnr'] = seqnr
             iq['rejected']['error'] = error_msg
-            iq.send(block=False)
+            iq.send()
 
     def _threaded_node_request(self, session, process_fields, flags):
         """
@@ -515,21 +515,21 @@ class XEP_0323(BasePlugin):
                     self.sessions[s]["commTimers"][n].cancel()
 
                 # Confirm
-                iq.reply()
+                iq = iq.reply()
                 iq['type'] = 'result'
                 iq['cancelled']['seqnr'] = seqnr
-                iq.send(block=False)
+                iq.send()
 
                 # Delete session
                 del self.sessions[s]
                 return
 
         # Could not find session, send reject
-        iq.reply()
+        iq = iq.reply()
         iq['type'] = 'error'
         iq['rejected']['seqnr'] = seqnr
         iq['rejected']['error'] = "Cancel request received, no matching request is active."
-        iq.send(block=False)
+        iq.send()
 
     # =================================================================
     # Client side (data retriever) API
@@ -610,7 +610,7 @@ class XEP_0323(BasePlugin):
         iq['req']._set_flags(flags)
 
         self.sessions[seqnr] = {"from": iq['from'], "to": iq['to'], "seqnr": seqnr, "callback": callback}
-        iq.send(block=False)
+        iq.send()
 
         return seqnr
 
@@ -631,7 +631,7 @@ class XEP_0323(BasePlugin):
         iq['type'] = "get"
         iq['id'] = seqnr
         iq['cancel']['seqnr'] = seqnr
-        iq.send(block=False)
+        iq.send()
 
     def _get_new_seqnr(self):
         """ Returns a unique sequence number (unique across threads) """