Returns the parent bridge of a bridge.

    Args:
        br: A string - bridge name

    Returns:
        Name of the parent bridge. This is the same as the bridge name if the
        bridge is not a fake bridge. If the bridge does not exist, False is
        returned.

    CLI Example:

    .. code-block:: bash

        salt '*' openvswitch.bridge_to_parent br0

def bridge_to_parent(br):
    '''
    Returns the parent bridge of a bridge.

    Args:
        br: A string - bridge name

    Returns:
        Name of the parent bridge. This is the same as the bridge name if the
        bridge is not a fake bridge. If the bridge does not exist, False is
        returned.

    CLI Example:

    .. code-block:: bash

        salt '*' openvswitch.bridge_to_parent br0

    '''
    cmd = 'ovs-vsctl br-to-parent {0}'.format(br)
    result = __salt__['cmd.run_all'](cmd)
    if result['retcode'] != 0:
        return False
    return result['stdout']