Add helper to deconfigure an interface

[ConnorRigby]

I find myself writing this helper for every project that uses VintageNet, so i thought i'd just put it here.

[fhunleth]

I like this. The only hesitation is that if you deconfigure and call configured_interfaces/0, you'll still get the interface. What do you think of adding a filter on configured_interfaces/0 to prune it of everything with a Null configuration?

In case you're wondering why I never implemented a complete delete, the reason is that I ran into a race condition with a back-to-back delete and re-add at one point. I thought that the benefit of removing a configuration was so small that it wasn't worth maintaining.

[ConnorRigby]

What do you think of adding a filter on configured_interfaces/0 to prune it of everything with a Null configuration?

This seems straightforward enough. Update incoming

[fhunleth]

Oh no, coverage has dropped below 80% and that changes the badge color. Could you add a short unit test?

[ConnorRigby]

@fhunleth i fixed the test i broke. Should i add another? Coverage seems to be right on the cusp of 80%

[fhunleth]

Yeah, it would be good to have at least one call to deconfigure in the unit tests.

[fhunleth]

Great! And thanks for adding the test.