<fix>[compute]: respect vm.migrationQuantity during host maintenance

Resolves: ZSTAC-81354

Change-Id: Iff2131b3a878444fa27641f24dd727fe4fa176fb

Author: AlanJager

compute/src/main/java/org/zstack/compute/host/HostBase.java

@@ -411,9 +411,8 @@ public void run(final FlowTrigger trigger, Map data) {
                             if (ordered != null) {
                                 vmUuids = ordered;
 
-                                logger.debug(String.format("%s ordered VMs for host maintenance, to keep the order, we will migrate VMs one by one",
-                                        ext.getClass()));
-                                migrateQuantity = 1;
+                                logger.debug(String.format("%s ordered VMs for host maintenance, migrate quantity: %d",
+                                        ext.getClass(), migrateQuantity));
                             }
                         }