Removed an unused import

git-svn-id: https://svn.apache.org/repos/asf/directory/shared/trunk@1587909 13f79535-47bb-0310-9956-ffa450edef68
Renamed the maxAttributeCount by maxRetrunLength

git-svn-id: https://svn.apache.org/repos/asf/directory/shared/trunk@1587922 13f79535-47bb-0310-9956-ffa450edef68