this patch allow to set -g option 1. -g allow to make a more secure ssh server config...

this patch allow to set -g option 1. -g allow to make a more secure ssh server configuration by avoiding brute force attack on root while allowing user to use password (where the username is more difficult to guess).

Matthieu
from #6736

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20219 3c298f89-4303-0410-b956-a3cf2f4a3e73