Add logging for easier debugging of failures:

  $ avocado --show=machine run tests/acceptance/virtio_check_params.py
   (1/1) tests/acceptance/virtio_check_params.py:VirtioMaxSegSettingsCheck.test_machine_types:
  machine: {'name': 'pc-i440fx-2.12', 'seg_max_adjust': 'false', 'device': 'virtio-scsi-pci'}
  machine: {'name': 'pc-i440fx-2.0', 'seg_max_adjust': 'false', 'device': 'virtio-scsi-pci'}
  machine: {'name': 'pc-q35-4.2', 'seg_max_adjust': 'false', 'device': 'virtio-scsi-pci'}
  machine: {'name': 'pc-i440fx-2.5', 'seg_max_adjust': 'false', 'device': 'virtio-scsi-pci'}
  machine: {'name': 'pc-i440fx-4.2', 'seg_max_adjust': 'false', 'device': 'virtio-scsi-pci'}
  ...

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200129212345.20547-19-philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 tests/acceptance/virtio_check_params.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tests/acceptance/virtio_check_params.py b/tests/acceptance/virtio_check_params.py
index 270f69d092..29e91bfa37 100755
--- a/tests/acceptance/virtio_check_params.py
+++ b/tests/acceptance/virtio_check_params.py
@@ -21,6 +21,7 @@
 import sys
 import os
 import re
+import logging
 
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 from qemu.machine import QEMUMachine
@@ -73,6 +74,9 @@ class VirtioMaxSegSettingsCheck(Test):
         return query_ok, props, error
 
     def check_mt(self, mt, dev_type_name):
+        mt['device'] = dev_type_name # Only for the debug() call.
+        logger = logging.getLogger('machine')
+        logger.debug(mt)
         with QEMUMachine(self.qemu_bin) as vm:
             vm.set_machine(mt["name"])
             for s in VM_DEV_PARAMS[dev_type_name]:
-- 
2.21.1