hotplug_mem: Update migration related params for Windows guest

Signed-off-by: NYumei Huang <yuhuang@redhat.com>

qemu/tests/cfg/hotplug_mem.cfg

@@ -120,10 +120,16 @@
             reboot_count = 1
         - guest_migration:
             sub_type = migration
-            migration_test_command = help
-            migration_bg_command = "cd /tmp; nohup tcpdump -q -i any -t ip host localhost"
-            migration_bg_check_command = pgrep tcpdump
-            migration_bg_kill_command = pkill -9 tcpdump
+            Linux:
+                migration_test_command = help
+                migration_bg_command = "cd /tmp; nohup tcpdump -q -i any -t ip host localhost"
+                migration_bg_check_command = pgrep tcpdump
+                migration_bg_kill_command = pkill -9 tcpdump
+            Windows:
+                migration_test_command = ver && vol
+                migration_bg_command = start ping -t localhost
+                migration_bg_check_command = tasklist | find /I "ping.exe"
+                migration_bg_kill_command = taskkill /IM ping.exe /F
             kill_vm_on_error = yes
             iterations = 2
             used_mem = 1024