core: remove duplicate "setStoragePoolId()" call

Exactly the same call to "setStoragePoolId()" is already performed in
"init()", see [1].
So I see no reason why the same code should be executed again in "validate()",
especially that "validate()" is designed for other purposes.

[1] https://github.com/oVirt/ovirt-engine/blob/ovirt-engine-4.5.2/backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/lsm/LiveMigrateDiskCommand.java#L143

Signed-off-by: Pavel Bar <pbar@redhat.com>

backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/lsm/LiveMigrateDiskCommand.java

@@ -86,7 +86,8 @@
 import org.ovirt.engine.core.vdsbroker.builder.vminfo.VmInfoBuildUtils;
 
 @NonTransactiveCommandAttribute(forceCompensation = true)
-public class LiveMigrateDiskCommand<T extends LiveMigrateDiskParameters> extends MoveOrCopyDiskCommand<T>implements SerialChildExecutingCommand {
+public class LiveMigrateDiskCommand<T extends LiveMigrateDiskParameters> extends MoveOrCopyDiskCommand<T>
+        implements SerialChildExecutingCommand {
 
     private Guid sourceQuotaId;
     private Guid sourceDiskProfileId;
@@ -618,8 +619,6 @@ protected boolean validate() {
             return failValidation(EngineMessage.CANNOT_LIVE_MIGRATE_VM_SHOULD_BE_IN_PAUSED_OR_UP_STATUS);
         }
 
-        setStoragePoolId(getVm().getStoragePoolId());
-
         if (!validate(new StorageDomainValidator(getDstStorageDomain()).isNotBackupDomain())
                 || !validateDestDomainsSpaceRequirements()) {
             return false;