qemu-iotests: add support for qed format

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/tests/qemu-iotests/019 b/tests/qemu-iotests/019
index e0187b1..4c82be2 100755
--- a/tests/qemu-iotests/019
+++ b/tests/qemu-iotests/019
@@ -44,7 +44,7 @@
 . ./common.pattern
 
 # Any format supporting backing files
-_supported_fmt qcow qcow2 vmdk
+_supported_fmt qcow qcow2 vmdk qed
 _supported_os Linux
 
 TEST_OFFSETS="0 4294967296"