Fix deprecation for django.db.backends.util

[kriberg]

Renamed django.db.backends.util to utils, ref:
sql.py:15: RemovedInDjango19Warning: The django.db.backends.util module has been renamed. Use django.db.backends.utils instead.

[minhnhdo]

@dcramer please merge this change as this is preventing upgrade to Django 1.9

[dcramer]

I dont use Django 1.9 or know anything about it. Additionally it's not clear to me that this wont break other versions of Django as it blindly changes an import statement.

Quite honestly, I'm tempted to deprecate this repo as it's no longer useful with the state of the world. Our primary reason for continuing its usage was for the threaded runserver, which is no longer only supported by devserver. If someone wants to take over maintainership they can take care of this patch.

[thoas]

This is not the right patch as it will break old Django versions.

@dcramer you should move this repository to the jazzband organization.

[justinsg]

Fixed in 4c5864a