INT-3162 Fix AbstractScriptExecutor Thread-Safety

JIRA: https://jira.springsource.org/browse/INT-3162
INT-3113: Use Lettuce Redis Client

* Ensure close connections after tests
* Remove `Thread.sleep` where it is possible

JIRA: https://jira.springsource.org/browse/INT-3113
INT-3113: Improve `RedisAvailableRule`

* Upgrade to Spring-Data-Redis-1.1.0
* Change Redis port to default one - 6379