Asgi-redis

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* Process-specific channel behaviour changed to match new spec
* Redis Sentinel channel layer added

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* Support for the ASGI statistics extension
* Distribution of items over multiple servers using consistent hashing is improved
* Handles timeout exceptions in newer redis-py library versions correctly
* Support for configuring the socket_connect_timeout, socket_timeout, socket_keepalive and socket_keepalive_options
options that are passed to redis-py.

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* Renamed "receive_many" to "receive"
* Improved (more explicit) error handling for Redis errors/old versions
* Bad hosts (string not lost) configuration now errors explicitly

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* Removed unused reverse channels-to-groups mapping keys as they were not
cleaned up proactively and quickly filled up databases.

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* Implemented group_channels method.

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* Added local-and-remote backend option (uses asgi_ipc)