chore(gae): delete region tags from standard/xmpp folder (#13090)

* chore(gae): add requirements.txt and requirements-test.txt

* chore(gae): delete region tags from standard/xmpp/xmpp.py

Author: eapl-gemugami

appengine/standard/xmpp/requirements-test.txt

@@ -0,0 +1,6 @@
+# pin pytest to 4.6.11 for Python2.
+pytest==4.6.11; python_version < '3.0'
+
+# pytest==8.3.4 and six==1.17.0 for Python3.
+pytest==8.3.4; python_version >= '3.0'
+six==1.17.0

appengine/standard/xmpp/requirements.txt

@@ -0,0 +1 @@
+

appengine/standard/xmpp/xmpp.py

@@ -16,10 +16,8 @@
 
 import logging
 
-# [START xmpp-imports]
 from google.appengine.api import xmpp
 
-# [END xmpp-imports]
 import mock
 import webapp2
 
@@ -29,18 +27,15 @@
 
 class SubscribeHandler(webapp2.RequestHandler):
     def post(self):
-        # [START track]
         # Split the bare XMPP address (e.g., user@gmail.com)
         # from the resource (e.g., gmail), and then add the
         # address to the roster.
         sender = self.request.get("from").split("/")[0]
         roster.add_contact(sender)
-        # [END track]
 
 
 class PresenceHandler(webapp2.RequestHandler):
     def post(self):
-        # [START presence]
         # Split the bare XMPP address (e.g., user@gmail.com)
         # from the resource (e.g., gmail), and then add the
         # address to the roster.
@@ -50,33 +45,27 @@ def post(self):
             status=self.request.get("status"),
             presence_show=self.request.get("show"),
         )
-        # [END presence]
 
 
 class SendPresenceHandler(webapp2.RequestHandler):
     def post(self):
-        # [START send-presence]
         jid = self.request.get("jid")
         xmpp.send_presence(jid, status="My app's status")
-        # [END send-presence]
 
 
 class ErrorHandler(webapp2.RequestHandler):
     def post(self):
-        # [START error]
         # In the handler for _ah/xmpp/error
         # Log an error
         error_sender = self.request.get("from")
         error_stanza = self.request.get("stanza")
         logging.error(
             "XMPP error received from {} ({})".format(error_sender, error_stanza)
         )
-        # [END error]
 
 
 class SendChatHandler(webapp2.RequestHandler):
     def post(self):
-        # [START send-chat-to-user]
         user_address = "example@gmail.com"
         msg = (
             "Someone has sent you a gift on Example.com. "
@@ -87,21 +76,16 @@ def post(self):
 
         if not chat_message_sent:
             # Send an email message instead...
-            # [END send-chat-to-user]
             pass
 
 
-# [START chat]
 class XMPPHandler(webapp2.RequestHandler):
     def post(self):
         message = xmpp.Message(self.request.POST)
         if message.body[0:5].lower() == "hello":
             message.reply("Greetings!")
 
 
-# [END chat]
-
-
 app = webapp2.WSGIApplication(
     [
         ("/_ah/xmpp/message/chat/", XMPPHandler),