Create option to include loopback interfaces, fix #102

[georghinkel]

We need the support for loopback interfaces for CI and verification purposes. The way the change is done means that no client has to be adjusted.

[georghinkel]

What needs to be done to make AppVeyor happy?

[queequac]

Seems the build pipeline is broken, I don't think the failure is related your commit. Unfortunately @richardschneider did not respond to issues for over an year now and pull requests are starving...