Upgrade to Django 1.11

- Deprecation warnings using Django 1.8 are resolved.
- Deprecation warnings using Django 1.11 are resolved.

- Admin: grappelli is no longer used.
- Upgrade to django-autocomplete-light v3 (v2 is not 1.11 compatible).
  * autocomplete.modelform_factory being dropped, code uses dal Select2
    views and widgets.

kfet/tests/testcases.py

@@ -57,7 +57,7 @@ class TestCaseMixin:
                     'path': request.get_full_path(),
                     'username': (
                         "'{}'".format(request.user)
-                        if request.user.is_authenticated()
+                        if request.user.is_authenticated
                         else 'anonymous'
                     ),
                     'code': response.status_code,
@@ -96,7 +96,7 @@ class TestCaseMixin:
                     'path': request.get_full_path(),
                     'username': (
                         "'%s'" % request.user
-                        if request.user.is_authenticated()
+                        if request.user.is_authenticated
                         else 'anonymous'
                     ),
                     'form_ctx': form_ctx,