[Bug 1034837] [NEW] authentication token expiry with openstack provider

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I hit this in a long running environment hosted on an openstack
deployment.

After a certain period of time (not sure how long) all provisioning
agent calls fail with 401 errors:

2012-08-09 10:55:25,555: juju.openstack at DEBUG: openstack: 401 '401 Unauthorized\n\nThis server could not verify that you are authorized to access the document you requested. Either you supplied the wrong credentials (e.g., bad password), or your browser does not understand how to supply the credentials required.\n\n Authentication required  '
2012-08-09 10:55:25,556: juju.agents.provision at ERROR: Cannot get machine list
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/juju/agents/provision.py", line 175, in process_machines
    provider_machines = yield self.provider.get_machines()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1043, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/lib/python2.7/dist-packages/twisted/python/failure.py", line 382, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/lib/python2.7/dist-packages/juju/providers/openstack/provider.py", line 103, in get_machines
    instances = yield self.nova.list_servers()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 551, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/juju/providers/openstack/client.py", line 268, in _json
    response.code, body))
ProviderInteractionError: Unexpected 401: '401 Unauthorized\n\nThis server could not verify that you are authorized to access the document you requested. Either you supplied the wrong credentials (e.g., bad password), or your browser does not understand how to supply the credentials required.\n\n Authentication required  '

restarting the provisioning agent on the bootstrap node resolved this
issue.

** Affects: juju
     Importance: Critical
         Status: Confirmed

** Affects: juju (Ubuntu)
     Importance: Undecided
         Status: New

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authentication token expiry with openstack provider
https://bugs.launchpad.net/bugs/1034837
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