config: Config - full configuration
nodes: List[NodeInfo] - all nodes
fuel_openstack_creds: OSCreds - openstack creds, discovered from fuel (or None)
openstack_openrc: OSCreds - openrc used for openstack cluster
discovered_nodes: List[NodeInfo] - list of discovered nodes
reused_nodes: List[NodeInfo] - list of reused nodes from cluster
spawned_vm_ids: List[int] - list of openstack VM id's, spawned for test
info/comment : str - run comment
info/run_uuid : str - run uuid
info/run_time : float - run unix time

# test results
result/{id}/info : TestInfo - test information: name, cluster config, test parameters, etc.
result/{id}/measurement/{node}/{name} : List[float] - measurements data. E.g.:
    result/{id}/measurement/node-12/iops   - for BW uses iops * block_sz
    result/{id}/measurement/node-12/lat_histo

metric/{node_name}/{dev}/{metric_name} : List[float] - node metrics data. E.g.:
    metric/node-22/cpu/load
    metric/node-22/sda/read_io
    metric/node-22/eth0/data_recv