* Use Lettuce Redis client; Redis module fixes
The Lettuce client is based on the Netty and more stable, than Jedis
therefore we get a performance improvement for tests
(it saves us at about 30 seconds).
Also this client doesn't fail for me on Windows sporadically (very often)
with the `ConnectionClosedException`
* After switching to the Netty-based client, we expose the interrupted
Thread issue in the `LockRegistryLeaderInitiator`.
If we interrupted (expected behavior), we try to unlock calling
`RedisLockRegistry`, but Netty client reject our request because the
thread is interrupted, therefore we never delete the lock when we yield
our leadership.
Fix the issue with shifting a `RedisTemplate.delete()` operation to the
`ExecutorService` when the current thread is interrupted
* Allow to configure such an `ExecutorService` and timeout to wait for
the `submit()` result
* Refactor `RedisAvailableRule` and all the Redis tests do not expose
the target `RedisConnectionFactory` implementation.
* Make all the test-cases based on the `connectionFactory` created by
the `RedisAvailableTests.setupConnectionFactory()`
* Tweak some unnecessary timeouts and sleeps for better tests task
throughput
* Add a `Log4j2LevelAdjuster` into the `RedisLockRegistryLeaderInitiatorTests`
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