runtornado: Move more imports to the top of the file.

This is needed for adding more specific type annotations but is
otherwise counterproductive since it increases the diff from the
original.

zerver/management/commands/runtornado.py

@@ -28,6 +28,17 @@ from zerver.lib.queue import setup_tornado_rabbitmq
 from zerver.lib.socket import get_sockjs_router, respond_send_message
 from zerver.middleware import async_request_stop
 
+from threading import Lock
+from django.core.handlers import base
+from django.core.urlresolvers import set_script_prefix
+from django.core import signals
+from tornado.wsgi import WSGIContainer
+from django.core.handlers.wsgi import WSGIRequest, get_script_name
+from six.moves import urllib
+from django import http
+from django.core import exceptions, urlresolvers
+from django.conf import settings
+
 if settings.USING_RABBITMQ:
     from zerver.lib.queue import get_queue_client
 
@@ -123,10 +134,6 @@ class Command(BaseCommand):
 #
 #  Modify the base Tornado handler for Django
 #
-from threading import Lock
-from django.core.handlers import base
-from django.core.urlresolvers import set_script_prefix
-from django.core import signals
 
 class AsyncDjangoHandler(tornado.web.RequestHandler, base.BaseHandler):
     initLock = Lock()
@@ -147,10 +154,6 @@ class AsyncDjangoHandler(tornado.web.RequestHandler, base.BaseHandler):
         allocate_handler_id(self)
 
     def get(self, *args, **kwargs):
-        from tornado.wsgi import WSGIContainer
-        from django.core.handlers.wsgi import WSGIRequest, get_script_name
-        from six.moves import urllib
-
         environ  = WSGIContainer.environ(self.request)
         environ['PATH_INFO'] = urllib.parse.unquote(environ['PATH_INFO'])
         request  = WSGIRequest(environ)
@@ -195,10 +198,6 @@ class AsyncDjangoHandler(tornado.web.RequestHandler, base.BaseHandler):
     # Based on django.core.handlers.base: get_response
     def get_response(self, request):
         "Returns an HttpResponse object for the given HttpRequest"
-        from django import http
-        from django.core import exceptions, urlresolvers
-        from django.conf import settings
-
         try:
             try:
                 # Setup default url resolver for this thread.