List available snapshots

    CLI example:

    .. code-block:: bash

        salt '*' snapper.list_snapshots config=myconfig

def list_snapshots(config='root'):
    '''
    List available snapshots

    CLI example:

    .. code-block:: bash

        salt '*' snapper.list_snapshots config=myconfig
    '''
    try:
        snapshots = snapper.ListSnapshots(config)
        return [_snapshot_to_data(s) for s in snapshots]
    except dbus.DBusException as exc:
        raise CommandExecutionError(
            'Error encountered while listing snapshots: {0}'
            .format(_dbus_exception_to_reason(exc, locals()))
        )