Add analog of bash _filter_qemu_img_check to python framework.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 tests/qemu-iotests/iotests.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 7f1aa187a9..14f1d47d52 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -403,6 +403,10 @@ def filter_img_info(output, filename):
         lines.append(line)
     return '\n'.join(lines)
 
+def filter_img_check(msg):
+    msg = re.sub(r'.*allocated.*fragmented.*compressed clusters', '', msg)
+    return re.sub(r'Image end offset: [0-9]+', '', msg).strip()
+
 def filter_imgfmt(msg):
     return msg.replace(imgfmt, 'IMGFMT')
 
-- 
2.21.3