qemu-iotests: ignore fragmentation information for qed

We added image fragmentation statistics functions to qemu-img several days
ago, those patches will cause "./check -qed" failed. This patch will ignore
fragmentation statistics information of qed format, and then "./check -qed"
will work.
Signed-off-by: NDong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/common.rc

@@ -130,6 +130,7 @@ _cleanup_test_img()
 _check_test_img()
 {
     $QEMU_IMG check -f $IMGFMT $TEST_IMG 2>&1 | \
+        grep -v "fragmented$" | \
     	sed -e 's/qemu-img\: This image format does not support checks/No errors were found on the image./'
 }