Command (# ifconfig lagg2 laggproto none) on 11.0-Current results into invalid option.
As per the FreeBSD Lagg man page, 'laggproto none' is a valid configuration option for users.
Attached patch considers 'laggproto none' as a valid configuration option.
i.e 'ifconfig lagg2 laggproto none' command should result into success and should apply 'none' protocol to lagg bundle.