Return a list of the hypervisors (nodes) which this Proxmox PVE machine manages

    CLI Example:

    .. code-block:: bash

        salt-cloud --list-locations my-proxmox-config

def avail_locations(call=None):
    '''
    Return a list of the hypervisors (nodes) which this Proxmox PVE machine manages

    CLI Example:

    .. code-block:: bash

        salt-cloud --list-locations my-proxmox-config
    '''
    if call == 'action':
        raise SaltCloudSystemExit(
            'The avail_locations function must be called with '
            '-f or --function, or with the --list-locations option'
        )

    # could also use the get_resources_nodes but speed is ~the same
    nodes = query('get', 'nodes')

    ret = {}
    for node in nodes:
        name = node['node']
        ret[name] = node

    return ret