Networking, side affects. when an "other type" interface is configured it's automatically created, but if the interface got unconfigured it's dropped,leading to broken laggs for example.

We should trust the "other type" create/drop to handle the interface itself and interface_bring_down() should only unconfigure it, so possible parent/child interfaces won't break for no reason.
Fixes part of https://github.com/opnsense/core/issues/1709