Redis-docker-harness

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- added the `redis_timeout` parameter to the argparse options to make the pubsub thread `sleep_time` parameter
configurable from the command-line (the default is now 0.01 instead of 0.001 to avoid high CPU load)
- the `create_parser` method can now specify the default values for: host, port, db, channel_in, channel_out, sleep_time

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- fixed password support when accessing environment variable

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- added support for supplying a password to use for the Redis connection (--password/--password_env)

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- initial release