CLI: autocompletion bug

@jlmjlm:

> Example:
> "router router0 add port type ExteriorRouter address 10.2.14.74 net 10.2.14.0/24"
> would work in addition to
> "router router0 add port type exterior address 10.2.14.74 net 10.2.14.0/24"
> 
> Autocompletion fails for port types both before and after this change.
