Ability to use a Redis URI

[valentinogagliardi]

Thanks for this nice project!

Most cloud providers give a Redis connection URI like redis://h:asdfqwer1234asdf@ec2-111-1-1-1.compute-1.amazonaws.com:111. The current implementation of django-q does not allow this format. Would be nice to have the ability to set it in the cluster configuration:

Q_CLUSTER = {
    'name': 'project name',
    # omit
    'label': 'Django Q',
    'redis': 'redis://h:asdfqwer1234asdf@ec2-111-1-1-1.compute-1.amazonaws.com:111'
}

That would be in line with the redis-py native url notation. I took a look at redis_broker.py and shouldn't be hard to tweak the relevant method:

    @staticmethod
    def get_connection(list_key=Conf.PREFIX):
        if django_redis and Conf.DJANGO_REDIS:
            return django_redis.get_redis_connection(Conf.DJANGO_REDIS)
        return redis.StrictRedis(**Conf.REDIS)

Let me know if there is any interested in this. I'd start working on a PR.