net.dns: Automatically add nameserver 127.0.0.1 if /etc/resolv.conf missing or empty on a non-Windows system (thanks Louis Mamakos)

Merge waqas with Tobias. Eww.

Removed util/discohelper.lua

Removed core/discomanager.lua

modulemanager: Removed unused variables and reference to core.discomanager

modulemanager: Removed unnecessary code in the unload function

modulemanager: Removed legacy disco#items hook

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