Proxy install

[teclator]

Problem

In #696 we added support for configuring the proxy when booting the installation system but the configuration is lost after the installation.

• https://trello.com/c/gmOcIc0b/3404-5-agama-proxy-configuration-first-simplistic-approach

Solution

The proxy configuration will be copied to the target system when a proxy is used as well as the microos-tools package will be installed.

Testing

• Added a new unit test
• Tested manually

[coveralls]

coverage: 72.182% (+0.08%) from 72.1% when pulling fee7ad4 on proxy_install into 55a84ba on master.

[imobachgs]

It looks good to me, although I think that the logic to handle the proxy configuration should be in the Network service (instead of the Manager). However, let's consider the current implementation good enough.

Please add the entry to the changes file.

[teclator]

It looks good to me, although I think that the logic to handle the proxy configuration should be in the Network service (instead of the Manager). However, let's consider the current implementation good enough.

Please add the entry to the changes file.

I agree, lets do it separately by now and then integrate it in the network service implementing it completely in Rust.

[imobachgs]

BTW, the integration tests are failing, but it is a known (and already) fixed issue. It would be fine after you merge.

[teclator]

Rebased with master and added changelog