old invalid user listeners yet, though (ie. if a team dies).
* Implemented userland network monitor functions.
* Added a few notifications to the network stack, even though this part isn't
complete yet (especially notify_interface_changed()).
* Added optional debug output to the notifications module.
* Added the module to the image, it basically works now (tested).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28825 a95241bf-73f2-0310-859d-f6bbb57e9c96
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