Status timeout collecting logs prevents teardown

[Martin Packman]

If the status call as part of the log collection step fails, CI can error out and fail to destroy the controller. See for instance:

<http://reports.vapour.ws/releases/4551/job/functional-ha-recovery/attempt/3877>

2016-11-02 20:22:54 WARNING Failed to retrieve status for dumping logs: Timed out waiting for juju status to succeed
Traceback (most recent call last):
  File "/var/lib/jenkins/juju-ci-tools/assess_recovery.py", line 203, in <module>
    main(sys.argv[1:])
  File "/var/lib/jenkins/juju-ci-tools/assess_recovery.py", line 199, in main
    assess_recovery(bs_manager, args.strategy, args.charm_series)
  File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/mnt/jenkins/juju-ci-tools/deploy_stack.py", line 893, in booted_context
    yield machines
  File "/usr/lib/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/mnt/jenkins/juju-ci-tools/deploy_stack.py", line 802, in runtime_context
    self.dump_all_logs()
  File "/mnt/jenkins/juju-ci-tools/deploy_stack.py", line 848, in dump_all_logs
    client, artifacts_dir, runtime_config, known_hosts)
  File "/mnt/jenkins/juju-ci-tools/deploy_stack.py", line 220, in dump_env_logs_known_hosts
    remote_machines = get_remote_machines(client, known_hosts)
  File "/mnt/jenkins/juju-ci-tools/deploy_stack.py", line 275, in get_remote_machines
    machines[machine_id] = remote_from_address(address)
  File "/mnt/jenkins/juju-ci-tools/remote.py", line 39, in remote_from_address
    return remotecls(None, None, address, series=series)
  File "/mnt/jenkins/juju-ci-tools/remote.py", line 49, in __init__
    raise ValueError("Remote needs either address or client and unit")
ValueError: Remote needs either address or client and unit