Remove unnecessary imports

Author: Julien Hervot de Mattos Vaz

plugins/database/quota/src/main/java/org/apache/cloudstack/api/response/QuotaResponseBuilderImpl.java

@@ -114,7 +114,6 @@
 import com.cloud.user.dao.AccountDao;
 import com.cloud.user.dao.UserDao;
 import com.cloud.utils.Pair;
-import com.cloud.utils.db.Filter;
 import com.cloud.event.ActionEvent;
 import com.cloud.event.EventTypes;