fix checkstyle

Author: abh1sar

api/src/main/java/org/apache/cloudstack/api/ResponseGenerator.java

@@ -38,7 +38,6 @@
 import org.apache.cloudstack.api.response.AutoScaleVmProfileResponse;
 import org.apache.cloudstack.api.response.BackupOfferingResponse;
 import org.apache.cloudstack.api.response.BackupRepositoryResponse;
-import org.apache.cloudstack.api.response.BackupResponse;
 import org.apache.cloudstack.api.response.BackupScheduleResponse;
 import org.apache.cloudstack.api.response.BucketResponse;
 import org.apache.cloudstack.api.response.CapacityResponse;
@@ -142,7 +141,6 @@
 import org.apache.cloudstack.api.response.VpcResponse;
 import org.apache.cloudstack.api.response.VpnUsersResponse;
 import org.apache.cloudstack.api.response.ZoneResponse;
-import org.apache.cloudstack.backup.Backup;
 import org.apache.cloudstack.backup.BackupOffering;
 import org.apache.cloudstack.backup.BackupRepository;
 import org.apache.cloudstack.backup.BackupSchedule;

server/src/main/java/com/cloud/api/ApiResponseHelper.java

@@ -65,7 +65,6 @@
 import org.apache.cloudstack.api.response.AutoScaleVmProfileResponse;
 import org.apache.cloudstack.api.response.BackupOfferingResponse;
 import org.apache.cloudstack.api.response.BackupRepositoryResponse;
-import org.apache.cloudstack.api.response.BackupResponse;
 import org.apache.cloudstack.api.response.BackupScheduleResponse;
 import org.apache.cloudstack.api.response.BgpPeerResponse;
 import org.apache.cloudstack.api.response.BucketResponse;
@@ -186,7 +185,6 @@
 import org.apache.cloudstack.api.response.VpcResponse;
 import org.apache.cloudstack.api.response.VpnUsersResponse;
 import org.apache.cloudstack.api.response.ZoneResponse;
-import org.apache.cloudstack.backup.Backup;
 import org.apache.cloudstack.backup.BackupOffering;
 import org.apache.cloudstack.backup.BackupRepository;
 import org.apache.cloudstack.backup.BackupSchedule;