def credentials(cloud='<STR_LIT>'):
return get_cloud_config(cloud=cloud).get_auth_args()<EOL>
Retrieves credentials to run functional tests

    Credentials are either read via os-client-config from the environment
    or from a config file ('clouds.yaml'). Environment variables override
    those from the config file.

    devstack produces a clouds.yaml with two named clouds - one named
    'devstack' which has user privs and one named 'devstack-admin' which
    has admin privs. This function will default to getting the devstack-admin
    cloud as that is the current expected behavior.