[Enhancement] Optionally disable the official version notice

[braydenm303]

Not every system can run the new, official Linux client. Some systems don't meet the requirements to run the official app, but can run this community client (ie. Ubuntu 18.04). The call to action statement added in commit 472512720f3e8e5a8a831a7d8d8f12f1d917ac27 becomes rather annoying after running the client several times, and it pollutes stdout with unnecessary information when using the community client in a shell script.

I would like to see an option in the configuration to disable the official app message.

[jtfen86]

One way to silence that message is to use Connman instead of NetworkManager or something else. It's only there for NetworkManager users. I try to stay away from any GNOME software and Connman works just fine.