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Perform multiple connection attempts when connecting a Redis Cluster #244

Motivation: When the first node in the partition collection is down the RedisClusterClient cannot connect anymore to the Cluster

The RedisClusterClient uses every node from the partition list as candidate for a connection attempt and hence uses the number of partition entries as connection attempts. The first successful attempt is used as the main cluster connection. If all nodes fail to connect the connection method is terminated with the first causing exception.

Modifications:
* Multiple connection attempts
* Use round-robin for connect/reconnect the main cluster connection
* Aligned logging when a connection is not possible
* New cluster node for test
* Reset connections that failed to connect instead of closing them

Backport of #164.

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