functional tests are broken because of a tempest change

[Angus Salkeld]

See: http://logs.openstack.org/41/92741/1/gate/gate-solum-devstack-dsvm/3323839/console.html

heaps of failures like this:

2014-05-08 23:23:56.920 | 2014-05-08 23:23:56.869 | ERROR: functionaltests.api.v1.test_assembly.TestAssemblyController.test_assemblies_get_not_found
2014-05-08 23:23:56.925 | 2014-05-08 23:23:56.874 | ----------------------------------------------------------------------
2014-05-08 23:23:56.929 | 2014-05-08 23:23:56.878 | _StringException: Traceback (most recent call last):
2014-05-08 23:23:56.933 | 2014-05-08 23:23:56.882 | File "/opt/stack/new/solum/functionaltests/api/base.py", line 39, in setUp
2014-05-08 23:23:56.938 | 2014-05-08 23:23:56.887 | mgr = clients.Manager(username, password, tenant_name)
2014-05-08 23:23:56.942 | 2014-05-08 23:23:56.891 | File "/opt/stack/new/tempest/tempest/clients.py", line 205, in __init__
2014-05-08 23:23:56.946 | 2014-05-08 23:23:56.895 | super(Manager, self).__init__(credentials=credentials)
2014-05-08 23:23:56.951 | 2014-05-08 23:23:56.900 | File "/opt/stack/new/tempest/tempest/manager.py", line 46, in __init__
2014-05-08 23:23:56.955 | 2014-05-08 23:23:56.904 | if not self.credentials.is_valid():
2014-05-08 23:23:56.959 | 2014-05-08 23:23:56.908 | AttributeError: 'str' object has no attribute 'is_valid'

I believe because of this commit: https://github.com/openstack/tempest/commit/83e8fa8c00b6386a0f2e452ddfe992ae2e21b062

[Angus Salkeld (asalkeld)]

committed as a part of the assembly delete patch: https://review.openstack.org/#/c/91488/