test_rebuild_instance_with_volume fails on shared storage backends

[Matt Riedemann]

Like so:

http://logs.openstack.org/90/269490/6/gate/gate-tempest-dsvm-full-ceph/7f01066/console.html

2016-02-08 23:26:09.875 | Captured traceback:
2016-02-08 23:26:09.875 | ~~~~~~~~~~~~~~~~~~~
2016-02-08 23:26:09.875 | Traceback (most recent call last):
2016-02-08 23:26:09.875 | File "tempest/test.py", line 113, in wrapper
2016-02-08 23:26:09.875 | return f(self, *func_args, **func_kwargs)
2016-02-08 23:26:09.875 | File "tempest/scenario/test_rebuild_instance_with_volume.py", line 59, in test_rebuild_instance_with_volume
2016-02-08 23:26:09.875 | private_key=keypair['private_key'])
2016-02-08 23:26:09.875 | File "tempest/scenario/manager.py", line 624, in create_timestamp
2016-02-08 23:26:09.875 | ssh_client.make_fs(dev_name)
2016-02-08 23:26:09.875 | File "tempest/common/utils/linux/remote_client.py", line 181, in make_fs
2016-02-08 23:26:09.875 | self.exec_command(cmd_mkfs)
2016-02-08 23:26:09.875 | File "tempest/common/utils/linux/remote_client.py", line 43, in exec_command
2016-02-08 23:26:09.876 | return self.ssh_client.exec_command(cmd)
2016-02-08 23:26:09.876 | File "/opt/stack/new/tempest/.tox/all/local/lib/python2.7/site-packages/tempest_lib/common/ssh.py", line 168, in exec_command
2016-02-08 23:26:09.876 | stderr=err_data, stdout=out_data)
2016-02-08 23:26:09.876 | tempest_lib.exceptions.SSHExecCommandFailed: Command 'set -eu -o pipefail; PATH=$PATH:/sbin; sudo /usr/sbin/mke2fs -t ext4 /dev/vdb', exit status: 1, stderr:
2016-02-08 23:26:09.876 | mke2fs 1.42.2 (27-Mar-2012)
2016-02-08 23:26:09.876 | Could not stat /dev/vdb --- No such file or directory
2016-02-08 23:26:09.876 |
2016-02-08 23:26:09.876 | The device apparently does not exist; did you specify it correctly?
2016-02-08 23:26:09.876 |
2016-02-08 23:26:09.876 | stdout:

The test was already reverted here:

https://review.openstack.org/#/c/277540/

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Could%20not%20stat%20%2Fdev%2Fvdb%20---%20No%20such%20file%20or%20directory%5C%22%20AND%20tags%3A%5C%22console%5C%22&from=7d

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