OPENDJ-1116 Introduce abstraction for the changelog DB

Jean-Noel Rouvignac

10.32.2013 b4a1565a2ab3cd0192a1b17c026f16e151fd04ca

opends/src/server/org/opends/server/replication/server/changelog/api/ReplicaDBCursor.java does not exist in tree c6d28657c6d9cc5eadc3a7b0989b6718e79345a0