feat(e2e): Add tests for the 'net' set of commands

[craciunoiuc]

Prerequisite checklist

• Read the contribution guidelines regarding submitting new changes to the project;
• Tested your changes against relevant architectures and platforms;
• Ran make fmt on your commit series before opening this PR;
• Updated relevant documentation.

Description of changes

To run the tests you will need to be root or run with sudo because the commands manipulate network interfaces.

Hopefully this works in the actions, otherwise we can just try to skip them in the action.

[antoineco]

General comments:

• All these commands are intertwined inside the test suites. inspect depends on up, down and rm for example. It seems like we could have easily covered most of them in a single suite.

• It would have been interesting to test that a unikernel can actually make use of the network created by those commands (e.g. nginx from our catalog).

[craciunoiuc]

Yes, for the first point, I wanted to use ifconfig to do what kraft does but then I realised that it's not really a good, generic way to test. So, better to just throw all commands in there and see where it breaks.

For the second point, it will surely be covered in the kraft run tests. Here we can at most add a ping to the bridge to see if it's up

[antoineco]

Regarding the first point, what I meant is that you could pretty much keep only the file that's currently called net_inspect, and still cover almost all relevant functionalities.
If the goal is to test a lot of combinations of flags I agree that we need a tests suite for every subcommand. However I would focus only on the edge cases in these, to avoid the redundancy of the "happy path".

This is not a request for change btw, just an observation to reduce redundancy in the future. The code is written so let's keep it.

[craciunoiuc]

Took a bit more to solve all stuff

I now suffixed every set of commands with the command name. Should make things a bit less confusing + less chance for errors because input/output won't (potentially) spill between commands

[craciunoiuc]

aaand tests fail now online

[craciunoiuc]

Even version fails, strange

[craciunoiuc]

and now they seem to pass, wut