compat: only add compat implementation of RequestFactory.generic() if not

provided by django

rest_framework/compat.py

@@ -199,8 +199,6 @@ if 'patch' not in View.http_method_names:
     View.http_method_names = View.http_method_names + ['patch']
 
 
-# RequestFactory only provides `generic` from 1.5 onwards
-from django.test.client import RequestFactory as DjangoRequestFactory
 from django.test.client import FakePayload
 
 try:
@@ -211,7 +209,11 @@ except ImportError:
     from django.utils.encoding import smart_str as force_bytes_or_smart_bytes
 
 
-class RequestFactory(DjangoRequestFactory):
+# RequestFactory only provides `generic` from 1.5 onwards
+if django.VERSION < (1, 5):
+    from django.test.client import RequestFactory as DjangoRequestFactory
+
+    class RequestFactory(DjangoRequestFactory):
         def generic(self, method, path,
                 data='', content_type='application/octet-stream', **extra):
             parsed = _urlparse(path)
@@ -229,6 +231,8 @@ class RequestFactory(DjangoRequestFactory):
                 })
             r.update(extra)
             return self.request(**r)
+else:
+    from django.test.client import RequestFactory
 
 
 # Markdown is optional