Make connectivity checks optional via UI

[ghost]

I wanted to install Antergos at work and I've spent hours trying to do so. We have a restrictive corporate firewall that blocks uncommon ports (i.e. everything that is not web, ftp or mail) and untrusted websites (based on Fortinet).

cnchi tried to get the external IP via ipstack, which was over quota and failed, then via antergos-beta.tk on port 3000, which was blocked, then tried to reach several hard-coded IPs (blocked for unknown reasons) and finally build.antergos.com.

I know the geoip module can be used to figure out the right locale, but I'd appreciate if all of these checks could be disabled at once by ticking a checkbox in the UI or something, and then one could manually choose the needed configuration parameters.

I have also tried specifying the command line option --no-check to make checks optional, but it doesn't seem to skip ALL of those connection attempts, plus for some reason starting cnchi manually with sudo or from root (in order to specify the --no-check parameter) causes PermissionError issues here similar to this one, right after cnchi finishes partitioning the disk.