iotests: Omit length/offset test in 040 and 041

As of a follow-up patch to this one, the length of a mirror block job
will no longer directly depend on the size of the block device;
therefore, drop these checks from this test. Instead, just check whether
the final offset equals the block job length.

As 041 uses the wait_until_completed function from iotests.py, the same
applies there as well which in turn affects tests 030, 055 and 056. On
the other hand, a block job's length does not have to be related to the
length of the image file in the first place, so that check was
questionable anyway.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1414159063-25977-7-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/tests/qemu-iotests/040 b/tests/qemu-iotests/040
index f1e16c1..2b432ad 100755
--- a/tests/qemu-iotests/040
+++ b/tests/qemu-iotests/040
@@ -43,8 +43,7 @@
                 if event['event'] == 'BLOCK_JOB_COMPLETED':
                     self.assert_qmp(event, 'data/type', 'commit')
                     self.assert_qmp(event, 'data/device', 'drive0')
-                    self.assert_qmp(event, 'data/offset', self.image_len)
-                    self.assert_qmp(event, 'data/len', self.image_len)
+                    self.assert_qmp(event, 'data/offset', event['data']['len'])
                     if need_ready:
                         self.assertTrue(ready, "Expecting BLOCK_JOB_COMPLETED event")
                     completed = True
@@ -52,7 +51,6 @@
                     ready = True
                     self.assert_qmp(event, 'data/type', 'commit')
                     self.assert_qmp(event, 'data/device', 'drive0')
-                    self.assert_qmp(event, 'data/len', self.image_len)
                     self.vm.qmp('block-job-complete', device='drive0')
 
         self.assert_no_active_block_jobs()