[PC-BSD Testing] installer does not support proxy (needs an input so user can set)

[Dru Lavigne]

A user on IRC indicates that a netinstall doesn't work if the user is behind a proxy. Adding three input fields to this screen:

http://wiki.pcbsd.org/index.php/File:Network_install1.png

that allow a user to:

1. selct FTP or HTTP from a drop-down menu
2. input an IP address (mandatory)
3. input a port number (optional)

should fix this problem.

The backend should take the input and turn it into a command such as:

setenv HTTP_PROXY http://1.2.3.4

or

setenv FTP_PROXY ftp://1.2.3.4:8080

Assuming the backend is using csh/tcsh.

The user can assist in testing this functionality.

Cheers,

Dru