tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

resolved: teach resolved the difference between "routing" and "search" domains Following the changes to expose the "routing" and "search" domain concepts in networkd, actually make resolved use them. It will now use routing domains exclusively for making DNS routing decisions, and use search domains additionally for extending single-label names.

resolved: fix typo Noticed by @vcaputo

resolved: rework DNSSECSupported property Not only report whether the server actually supports DNSSEC, but also first check whether DNSSEC is actually enabled for it in our local configuration. Also, export a per-link DNSSECSupported property in addition to the existing manager-wide property.

resolved: add SetLinkXYZ() method counterparts on the Link object So far, we exposed SetLinkXYZ() on the Manager interface, to set a couple of link properties. This adds similar calls SetXYZ() on the Link interface, and makes sure the former is little more than a shortcut to the latter. SetLinkXYZ() has the benefit of not requiring a GetLink() round trip for setting these properties, while the method actually belongs to the Link objects, and this change corrects that.

resolved: expose bus objects for each Link The link objects expose as properties the current settings made with SetLinkDNS() and related calls, plus some more information.