test_snapshot_pattern.py failure: Initializing SSH connection failed - SSHTimeout

[Kashyap Chamarthy]

This was noticed froma failure of with "check-grenade-dsvm-partial-ncpu'" test job[1] from test 'tempest/scenario/test_snapshot_pattern.py'

Relevant log snippet form console.html:
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2014-08-27 08:28:47.776 | 2014-08-27 08:28:41,120 9490 INFO [tempest.common.debug] Host ns list[]
2014-08-27 08:28:47.777 | 2014-08-27 08:28:41,121 9490 ERROR [tempest.scenario.test_snapshot_pattern] Initializing SSH connection failed
2014-08-27 08:28:47.777 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern Traceback (most recent call last):
2014-08-27 08:28:47.777 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern File "tempest/scenario/test_snapshot_pattern.py", line 52, in _ssh_to_server
2014-08-27 08:28:47.777 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern return self.get_remote_client(server_or_ip)
2014-08-27 08:28:47.778 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern File "tempest/scenario/manager.py", line 332, in get_remote_client
2014-08-27 08:28:47.778 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern linux_client.validate_authentication()
2014-08-27 08:28:47.778 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern File "tempest/common/utils/linux/remote_client.py", line 54, in validate_authentication
2014-08-27 08:28:47.779 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern self.ssh_client.test_connection_auth()
2014-08-27 08:28:47.779 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern File "tempest/common/ssh.py", line 151, in test_connection_auth
2014-08-27 08:28:47.779 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern connection = self._get_ssh_connection()
2014-08-27 08:28:47.780 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern File "tempest/common/ssh.py", line 88, in _get_ssh_connection
2014-08-27 08:28:47.780 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern password=self.password)
2014-08-27 08:28:47.780 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern SSHTimeout: Connection to the 172.24.4.1 via SSH timed out.
2014-08-27 08:28:47.781 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern User: cirros, Password: None
2014-08-27 08:28:47.781 | 2014-08-27 08:28:41.121 9490 TRACE tempest.scenario.test_snapshot_pattern
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And, I see 61 hits in last 24 hours, from logstash[2]. And, here's a similar bug[3].

  [1] http://logs.openstack.org/04/117104/2/check/check-grenade-dsvm-partial-ncpu/d3829fe/console.html
  [2] http://logstash.openstack.org/#eyJzZWFyY2giOiJcIlt0ZW1wZXN0LnNjZW5hcmlvLnRlc3Rfc25hcHNob3RfcGF0dGVybl0gSW5pdGlhbGl6aW5nIFNTSCBjb25uZWN0aW9uIGZhaWxlZFwiIiwiZmllbGRzIjpbXSwib2Zmc2V0IjowLCJ0aW1lZnJhbWUiOiI4NjQwMCIsImdyYXBobW9kZSI6ImNvdW50IiwidGltZSI6eyJ1c2VyX2ludGVydmFsIjowfSwic3RhbXAiOjE0MDkyMjM4NDEzMjB9
  [3] https://bugs.launchpad.net/grenade/+bug/1349617 --
test_volume_boot_pattern fails in grenade with "SSHException: Error reading SSH protocol banner[Errno 104] Connection reset by peer"