Reorder imports, move comment, use logging.warning

- Reorder argo_ams_library imports alphabetically.
- Move comment to more logical position.
- Change logging.warn to .warning as former is deprecating.

ssm/ssm2.py

@@ -37,7 +37,7 @@
 from logging import getLogger, INFO, WARNING, DEBUG
 
 try:
-    from argo_ams_library import ArgoMessagingService, AmsMessage, AmsServiceException
+    from argo_ams_library import AmsMessage, ArgoMessagingService, AmsServiceException
 except ImportError:
     # ImportError is raised later on if AMS is requested but lib not installed.
     ArgoMessagingService = None
@@ -494,8 +494,8 @@ def send_all(self):
                 log_string = "Sent %s" % msgid
 
             elif self._protocol == Ssm2.AMS_MESSAGING:
+                # Then we are sending to an Argo Messaging Service instance.
                 try:
-                    # Then we are sending to an Argo Messaging Service instance.
                     argo_id = self._send_msg_ams(text, msgid)
                     log_string = "Sent %s, Argo ID: %s" % (msgid, argo_id)
 
@@ -504,7 +504,7 @@ def send_all(self):
                     if "Message size is too large" not in str(e):
                         raise
                     else:
-                        log.warn('Message %s could not be sent as its larger than 1MB', msgid)
+                        log.warning('Message %s could not be sent as its larger than 1MB', msgid)
 
                         # Add the message to the rejected queue
                         name = self._rejectq.add(text)