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: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/tests/qemu-iotests/025 b/tests/qemu-iotests/025
index 691b6da..7062aa6 100755
--- a/tests/qemu-iotests/025
+++ b/tests/qemu-iotests/025
@@ -39,7 +39,7 @@
 . ./common.filter
 . ./common.pattern
 
-_supported_fmt raw qcow2
+_supported_fmt raw qcow2 qed
 _supported_proto file sheepdog rbd
 _supported_os Linux