OPENDJ-1471 File based changelog : improve cursor behavior
CR-3920

[Note: real merge of all changelog.file package content to be done in one shot in
 a future commit]

Third and last step : all cursors related to ChangeNumberindexDB now 
 behave like java.sql.ResultSet API. 

* FileChangeNumberIndexDBCursor, JEChangeNumberIndexDBCursor: 
 now behave like ResultSet API

* ECLServerHandler : adapt to changes of underlying cursor 
 on ChangeNumberIndexDB

* FileChangeNumberIndexDBTest, JEChangeNumberIndexDBTest: 
 adapt to changes on cursor

 * ChangeNumberIndexDB : javadoc fix
 
 * ReplicationEnvironment : change default log file size to 10M