tests: qemuxml2argv: Add a 'serial' value for a SCSI disk

Upcoming addition of a new field will need to make sure that SCSI disk
serial is tested as well. Add a case to one of the existing tests.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>

tests/qemuxml2argvdata/disk-scsi.x86_64-latest.args

@@ -34,7 +34,7 @@ file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
 -device scsi-hd,bus=scsi0.0,scsi-id=0,drive=drive-scsi0-0-0,id=scsi0-0-0 \
 -drive file=/tmp/scsidisk2.img,format=raw,if=none,id=drive-scsi1-0-0-0 \
 -device scsi-hd,bus=scsi1.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi1-0-0-0,\
-id=scsi1-0-0-0 \
+id=scsi1-0-0-0,serial=abcdefghijklmn \
 -drive file=/tmp/scsidisk3.img,format=raw,if=none,id=drive-scsi2-0-0-0 \
 -device scsi-hd,bus=scsi2.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi2-0-0-0,\
 id=scsi2-0-0-0,wwn=0x5000c50015ea71ac \

tests/qemuxml2argvdata/disk-scsi.xml

@@ -28,6 +28,7 @@
       <source file='/tmp/scsidisk2.img'/>
       <target dev='sdb' bus='scsi'/>
       <address type='drive' controller='1' bus='0' target='0' unit='0'/>
+      <serial>abcdefghijklmn</serial>
     </disk>
     <disk type='file' device='disk'>
       <source file='/tmp/scsidisk3.img'/>

tests/qemuxml2xmloutdata/disk-scsi.xml

@@ -30,6 +30,7 @@
       <driver name='qemu' type='raw'/>
       <source file='/tmp/scsidisk2.img'/>
       <target dev='sdb' bus='scsi'/>
+      <serial>abcdefghijklmn</serial>
       <address type='drive' controller='1' bus='0' target='0' unit='0'/>
     </disk>
     <disk type='file' device='disk'>