Merge pull request #1512 from lijinlijin/single_driver_install

single_driver_install: No need to switch system to ide when install storage drivers

qemu/tests/cfg/single_driver_install.cfg

@@ -53,9 +53,6 @@
             driver_name = viostor
             device_name = "Red Hat VirtIO SCSI controller"
             device_hwid = '"PCI\VEN_1AF4&DEV_1001" "PCI\VEN_1AF4&DEV_1042"'
-            drive_format_image1 = ide
-            q35:
-                drive_format_image1 = ahci
             images += " stg"
             image_name_stg = "images/storage"
             image_size_stg = 4G
@@ -66,9 +63,6 @@
             driver_name = vioscsi
             device_name = "Red Hat VirtIO SCSI pass-through controller"
             device_hwid = '"PCI\VEN_1AF4&DEV_1004" "PCI\VEN_1AF4&DEV_1048"'
-            drive_format_image1 = ide
-            q35:
-                drive_format_image1 = ahci
             images += " stg"
             image_name_stg = "images/storage"
             image_size_stg = 4G