Return a list of the BareMetal servers that are on the provider.

def list_nodes_full(call=None):
    ''' Return a list of the BareMetal servers that are on the provider.
    '''
    if call == 'action':
        raise SaltCloudSystemExit(
            'list_nodes_full must be called with -f or --function'
        )

    items = query(method='servers')

    # For each server, iterate on its parameters.
    ret = {}
    for node in items['servers']:
        ret[node['name']] = {}
        for item in node:
            value = node[item]
            ret[node['name']][item] = value
    return ret