Fixup DJANGO_SETTINGS_SKIP_LOCAL in tests (#3899)

The import path for the local_settings should be relative to the
test module and not absolute otherwise the import will fail.

Author: xrmx

readthedocs/settings/test.py

@@ -35,6 +35,6 @@ def LOGGING(self):  # noqa - avoid pep8 N802
 
 if not os.environ.get('DJANGO_SETTINGS_SKIP_LOCAL', False):
     try:
-        from local_settings import *  # noqa
+        from .local_settings import *  # noqa
     except ImportError:
         pass