channels_redis keeps stale connection to redis about channels_redis

[rythm-of-the-red-man]

Well, answer came faster than I tought. This issue was helpful. Since Azure Cache for Redis is not liberal one and healthcheck is off by default (and, I have to admit, poorly described in docs). If you don't mind I'll open PR with amends in docs that will better communicate that you actually can pass additional kwargs to redis-py clinet. In my opinion it might be helpful for users with managed redis instances.

Example of valid config:

    CHANNEL_LAYERS = {
        "default": {
            "BACKEND": "channels_redis.core.RedisChannelLayer",
            "CONFIG": {
                "hosts": [
                    {
                        "address": CHANNELS_REDIS_URL,
                        "retry_on_timeout": True,
                        "health_check_interval": 1,
                        "socket_keepalive": True,
                    }
                ],
                "capacity": 1500,
                "expiry": 5,
            },
        },
    }