Fix imports as suggested by isort

even for unchanged files, because TravisCI build fails.

daphne/testing.py

@@ -127,8 +127,8 @@ class DaphneProcess(multiprocessing.Process):
 
         from twisted.internet import reactor
 
-        from .server import Server
         from .endpoints import build_endpoint_description_strings
+        from .server import Server
 
         try:
             # Create the server class
@@ -266,8 +266,8 @@ class TestApplication:
 
 
 def _reinstall_reactor():
-    import sys
     import asyncio
+    import sys
 
     from twisted.internet import asyncioreactor
 

tests/test_http_request.py

@@ -3,10 +3,9 @@
 import collections
 from urllib import parse
 
-from hypothesis import assume, given, settings
-
 import http_strategies
 from http_base import DaphneTestCase
+from hypothesis import assume, given, settings
 
 
 class TestHTTPRequest(DaphneTestCase):

tests/test_http_response.py

@@ -1,9 +1,8 @@
 # coding: utf8
 
-from hypothesis import given, settings
-
 import http_strategies
 from http_base import DaphneTestCase
+from hypothesis import given, settings
 
 
 class TestHTTPResponse(DaphneTestCase):