Better imports

Narrowed down the scope of the imports, after checking out compat.py as
suggested, testsuite is happy.

Author: lucacorti

oauth2_provider/oauth2_validators.py

@@ -2,9 +2,9 @@
 
 import base64
 try:
-	import urllib.parse as urllib
+	from urllib.parse import unquote_plus
 except ImportError:
-	import urllib
+	from urllib import unquote_plus
 import logging
 from datetime import timedelta
 
@@ -48,7 +48,7 @@ def _authenticate_basic_auth(self, request):
         client_id, client_secret = auth_string_decoded.split(':', 1)
 
         try:
-            request.client = Application.objects.get(client_id=urllib.unquote_plus(client_id), client_secret=urllib.unquote_plus(client_secret))
+            request.client = Application.objects.get(client_id=unquote_plus(client_id), client_secret=unquote_plus(client_secret))
             return True
 
         except Application.DoesNotExist: