10 was used for socket.AF_INET6, but it is 30. So don't hardcode values.

10 was used for socket.AF_INET6, but it is 30. So don't hardcode values.

All tests playing with users will fail because of test structure. It needs to be refactored.

Additionaly fix small issue with test assertions.

Mock netifaces in order to simulate real behaviour of machine. Add another
part of "persistence", which allows simulation of network stack.

Make test more flexible and controlallbe by exposing groups.

Additionally add required "persistence" to test.

Override some methods and modules in order to get list of what would be done,
instead of having it done.