INT-3198: Add 'recovery-interval' for redis-q-c-a

JIRA: https://jira.springsource.org/browse/INT-3198

* Expose `RedisQueueMessageDrivenEndpoint.recoveryInterval` to Namespace support
* Add parser's tests
* Rename parser test class
* Polishing for concurrency of`RedisQueueMessageDrivenEndpointTests#testInt3196Recovery` test
* Add documentation for 'recovery-interval' and Redis Events implementation

Doc Polishing

Add more delay because of unsolvable race condition in the Redis Subscription - see DATAREDIS-242