Grizzly checks fails with "Could not create a volume" assertions

[Thierry Carrez]

Recent checks on stable/grizzly have been failing cinder-related tests with errors like:

2014-01-10 12:41:53.453 | ======================================================================
2014-01-10 12:41:53.453 | FAIL: tempest.tests.volume.admin.test_volume_types.VolumeTypesTest.test_create_get_delete_volume_with_volume_type_and_extra_specs
2014-01-10 12:41:53.454 | ----------------------------------------------------------------------
2014-01-10 12:41:53.454 | _StringException: Traceback (most recent call last):
2014-01-10 12:41:53.454 | File "/opt/stack/new/tempest/tempest/tests/volume/admin/test_volume_types.py", line 94, in test_create_get_delete_volume_with_volume_type_and_extra_specs
2014-01-10 12:41:53.454 | self.fail("Could not create correct volume with volume_type")
2014-01-10 12:41:53.454 | File "/usr/lib/python2.7/unittest/case.py", line 408, in fail
2014-01-10 12:41:53.454 | raise self.failureException(msg)
2014-01-10 12:41:53.454 | AssertionError: Could not create correct volume with volume_type

or

2014-01-10 12:41:53.459 | ======================================================================
2014-01-10 12:41:53.459 | FAIL: tempest.tests.volume.test_volumes_get.VolumesGetTest.test_volume_create_get_delete[smoke]
2014-01-10 12:41:53.459 | ----------------------------------------------------------------------
2014-01-10 12:41:53.459 | _StringException: Traceback (most recent call last):
2014-01-10 12:41:53.459 | File "/opt/stack/new/tempest/tempest/tests/volume/test_volumes_get.py", line 68, in test_volume_create_get_delete
2014-01-10 12:41:53.459 | self.fail("Could not create a volume")
2014-01-10 12:41:53.459 | File "/usr/lib/python2.7/unittest/case.py", line 408, in fail
2014-01-10 12:41:53.459 | raise self.failureException(msg)
2014-01-10 12:41:53.460 | AssertionError: Could not create a volume

or

2014-01-10 12:41:53.470 | ======================================================================
2014-01-10 12:41:53.470 | FAIL: tempest.tests.volume.test_volumes_get.VolumesGetTest.test_volume_get_metadata_none
2014-01-10 12:41:53.470 | ----------------------------------------------------------------------
2014-01-10 12:41:53.470 | _StringException: Traceback (most recent call last):
2014-01-10 12:41:53.470 | File "/opt/stack/new/tempest/tempest/tests/volume/test_volumes_get.py", line 95, in test_volume_get_metadata_none
2014-01-10 12:41:53.470 | self.fail("Could not get volume metadata")
2014-01-10 12:41:53.470 | File "/usr/lib/python2.7/unittest/case.py", line 408, in fail
2014-01-10 12:41:53.470 | raise self.failureException(msg)
2014-01-10 12:41:53.470 | AssertionError: Could not get volume metadata

Example at http://logs.openstack.org/50/60550/2/check/check-tempest-dsvm-full/c47d79a/
This seems to only affect grizzly, so it migth be something that was fixed recently in icehouse.