fix checkstyle

Author: JoaoJandre

engine/storage/snapshot/src/test/java/org/apache/cloudstack/storage/vmsnapshot/VMSnapshotStrategyKVMTest.java

@@ -29,7 +29,6 @@
 
 import javax.inject.Inject;
 
-import org.apache.cloudstack.backup.dao.BackupDao;
 import org.apache.cloudstack.backup.dao.BackupOfferingDao;
 import org.apache.cloudstack.engine.subsystem.api.storage.DataStore;
 import org.apache.cloudstack.engine.subsystem.api.storage.DataStoreManager;