Checkstyle error fixed

Author: shatoboar

engine/storage/volume/src/main/java/org/apache/cloudstack/storage/datastore/provider/DefaultHostListener.java

@@ -19,7 +19,11 @@
 package org.apache.cloudstack.storage.datastore.provider;
 
 import com.cloud.agent.AgentManager;
-import com.cloud.agent.api.*;
+import com.cloud.agent.api.Answer;
+import com.cloud.agent.api.CleanupPersistentNetworkResourceCommand;
+import com.cloud.agent.api.ModifyStoragePoolAnswer;
+import com.cloud.agent.api.ModifyStoragePoolCommand;
+import com.cloud.agent.api.SetupPersistentNetworkCommand;
 import com.cloud.agent.api.to.NicTO;
 import com.cloud.alert.AlertManager;
 import com.cloud.configuration.ConfigurationManager;