Checkpoint commit for OPENDJ-1174 Transfer responsibility for populating the ChangeNumberIndexDB to ChangelogDB 



ChangeNumberIndexer.java, ChangeNumberIndexerTest.java: ADDED

CompositeDBCursor.java:
Converted this class from holding a Collection of DBCursor to holding a Map of DBCursor with their associated data + generecized it.
Added getData().

CompositeDBCursorTest.java:
Consequence of the change to CompositeDBCursor.
Moved MyDBCursor inner class to its own file.

SequentialDBCursor.java: ADDED
Extracted from CompositeDBCursorTest.MyDBCursor.

ReplicationDomainDB.java:
Pulled up getCursorFrom(DN, int, CSN) in order to be able to mock it.

MultiDomainServerState.java:
In update(DN, CSN), simplified the code.
In update(DN, serverState), made the code better.
Added update(MultiDomainServerState), get(DN) and cover(DN, CSN).

AttributeTypeConstants.java:
Added support for 'o', 'ou' and 'dc'.

JEReplicaDBCursor.java:
In toString(), fixed display.