No way to apply a system wide proxy

There's no way to make a proxy applied on the entire system using the new network GUI.

for example, I can't run apt commands when connected to a network that explicitly requires a proxy to connect to the internet.

Launchpad Details: [#LP1627440](https://bugs.launchpad.net/bugs/1627440) Aboud Zakaria - 2016-09-25 06:25:58 +0000

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Start by locating the new network GUI's proxy settings and reviewing how it applies network configuration. Confirm the expected behavior with apt commands on a proxy-required network, and consider the work complete when the configured proxy applies system-wide.

Written by the indexing model from the issue text.