OPENDJ-66 (CR-1365) DS does not failover between replication servers in different groups when configured explicitly for one of the groups 

Code cleanup.

ReplicationBroker.java
In computeBestReplicationServer(), fixed the screwed up for (ctr) switch (ctr){}; pattern + added keepBest() method.
In computeBestServerForWeight(), used BigDecimal.valueOf() instead of ctor.
In changeConfig(), fixed complicated condition.
Added javadocs, fixed variable naming, used foreach.

StaticUtils.java:
Added toIterable().