Merge pull request #965 from XueqiangWei/migration_multi_host_virtio_blk_data_plane

tp-qemu.test: migrate_multi_host.virtio_blk_data_plane

multi_host_migration/tests/cfg/multi_host.cfg

@@ -506,6 +506,7 @@
 
                 - with_data_plane:
                     only Host_RHEL.m7
+                    only Linux
                     only virtio_blk virtio_scsi
                     type = migration_multi_host_with_stress
                     preprocess_env = yes
@@ -519,6 +520,7 @@
                     drive_rerror_image1 = stop
                     bg_stress_test = autotest_control
                     test_control_file = fio.control
+                    kill_bg_stress_cmd = "killall -9 fio"
 
         - cpuflags_multi_host:
             not_preprocess_host1 = yes