[j-nsp] protect ssh and telnet

[Vincent Bernat]

 ❦  4 avril 2016 22:23 -0400, Phil Shafer <phil at juniper.net> :

> Me, I don't even like allowing passwords.  JUNOS now supports the
> "system services ssh no-passwords" knob to force the use of ssh
> keys over text passwords.  And your radius server will happily serve
> ssh keys.  Force the move away from passwords.

On which attribute can SSH keys be served?
-- 
Choose variable names that won't be confused.
            - The Elements of Programming Style (Kernighan & Plauger)