device: don't capture resolve.conf for initial device config
This was called by via ... - manager:recheck_assume_connection() - manager:get_existing_connection() - nm_device_capture_initial_config() - update_ext_ip_config(initial=TRUE) and would parse resolv.conf, and try to fill the device IP config with nameservers and dns-options. But why? It would only have effect if NM was started with nm_dns_manager_get_resolv_conf_explicit(), but is that really sensible? And it would only take effect on devices that have a default route. And for what is this information even used? Let's not do it this way. If we need this information for assuming or external sys-iface mode, then it should be explicitly loaded at the appropriate moment. For now, drop it and see what breaks. Then we can fix it properly. If it even matters.
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