qemu.tests.cfg: Fix image path config for multi_disk test

Signed-off-by: NYiqiao Pu <ypu@redhat.com>
Signed-off-by: NQingtang Zhou <qzhou@redhat.com>

qemu/tests/cfg/multi_disk.cfg

@@ -11,7 +11,7 @@
         - one_disk_repeat:
             images += " stg"
             image_format_stg = qcow2
-            image_name_stg = storage
+            image_name_stg = images/storage
             image_size_stg = 1G
             image_boot_stg = no
             drive_index_stg = 1
@@ -22,13 +22,13 @@
             ide:
                 images += " stg stg2 stg3"
                 image_format_stg = qcow2
-                image_name_stg = storage
+                image_name_stg = images/storage
                 image_size_stg = 1G
                 image_format_stg2 = qcow2
-                image_name_stg2 = storage2
+                image_name_stg2 = images/storage2
                 image_size_stg2 = 10G
                 image_format_stg3 = raw
-                image_name_stg3 = storage3
+                image_name_stg3 = images/storage3
                 image_size_stg3 = 5G
             virtio_blk:
                 usbs = ""