'Initialization of Manager class.
Setup all services clients and make them available for tests cases.
:param credentials: type Credentials or TestResources
:param scope: default scope for tokens produced by the auth provider'

def __init__(self, credentials, scope='project'):

    (_, identity_uri) = get_auth_provider_class(credentials)
    super(Manager, self).__init__(credentials=credentials, identity_uri=identity_uri, scope=scope, region=CONF.identity.region)
    self._set_compute_clients()
    self._set_identity_clients()
    self._set_volume_clients()
    self._set_object_storage_clients()
    self._set_image_clients()
    self._set_network_clients()
