[PATCH] qemu-iotests/iotests.py: improve assert_qmp message

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Make it obvious, from the two values which is found at path and which
is expected.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---

It's a pain, I can never remember it, and checking each time in source
code who is who is boring.

 tests/qemu-iotests/iotests.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 709def4d5d..e805b9ab14 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -729,8 +729,8 @@ class QMPTestCase(unittest.TestCase):
             self.fail('no match for "%s" in %s' % (str(result), str(value)))
         else:
             self.assertEqual(result, value,
-                             'values not equal "%s" and "%s"'
-                                 % (str(result), str(value)))
+                             '"%s" is "%s", expected "%s"'
+                                 % (path, str(result), str(value)))
 
     def assert_no_active_block_jobs(self):
         result = self.vm.qmp('query-block-jobs')
-- 
2.21.0