Add Prompt for /etc/apt/apt.conf.d/11proxy Config to ws

[rwxrob]

Often using a workspace needs a specific SOCKS proxy set when using it
on contracts that require a VPN or other "walled garden" network
situation. Adding something similar to the following to the
/etc/apt/apt.conf.d/11proxy file addresses this:

Acquire::http::Proxy "http://internet.company.com:83";
Acquire::https::Proxy "http://internet.company.com:83";

These values should also be added to the regular proxy environment
variables and integrated into some sort of inside and outside script
toggle so that they can be disabled with the workspace is used outside
of the closed network.