Remove unused AggregationRelationDefinition class and references.

matthew_swift

24.36.2007 60094f579e610fb8338e5cb66d47684ad84a65af

opendj-sdk/opends/src/server/org/opends/server/admin/AggregationRelationDefinition.java does not exist in tree 97fba0f701303cf4d6f85abc5b9fbe0409ee62fe