qemu-iotests: add qed support to 025 image resize test

QED now supports the truncate (aka resize) operation for growing images.
Update test 025 so it runs for QED.
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

tests/qemu-iotests/025

@@ -39,7 +39,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 . ./common.filter
 . ./common.pattern
 
-_supported_fmt raw qcow2
+_supported_fmt raw qcow2 qed
 _supported_proto file sheepdog rbd
 _supported_os Linux