Renamed sql.py import to prevent RemovedInDjango19Warning

[justinsg]

When using Django 1.8.6 and django-devserver 0.8.0, I get three RemovedInDjango19Warning messages when running ./manage.py runserver.

/home/justin/.virtualenvs/myproject/local/lib/python2.7/site-packages/devserver/modules/sql.py:15: RemovedInDjango19Warning: The django.db.backends.util module has been renamed. Use django.db.backends.utils instead.
  from django.db.backends import util

/home/justin/.virtualenvs/myproject/local/lib/python2.7/site-packages/devserver/modules/sql.py:15: RemovedInDjango19Warning: The django.db.backends.util module has been renamed. Use django.db.backends.utils instead.
  from django.db.backends import util

/home/justin/.virtualenvs/myproject/local/lib/python2.7/site-packages/devserver/modules/sql.py:15: RemovedInDjango19Warning: The django.db.backends.util module has been renamed. Use django.db.backends.utils instead.
  from django.db.backends import util

Performing system checks...

System check identified no issues (0 silenced).
November 18, 2015 - 13:12:31
Django version 1.8.6, using settings 'myproject.local_settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.

I have renamed the imports as suggested by the exception messages and this stops the warnings from occurring. Backward compatibility is provided by catching the ImportError and importing the older module under the newer name.

[justinsg]

Fixed in 4c5864a