system: structurally improve boot sequence #6052
system: structurally improve boot sequence #6052

In some cases early DNS works with direct upstream queries for
fixed DNS servers.  For DHCP or other dynamic connectivity it
will likely never work as expected with interface-related host
lookup requests.

At least try to load /etc/resolv.conf along with /etc/hosts and
refresh when all interface configuration is active.  This needs
to rely on running configuration to pick up DHCP and the like
as said before.

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core