Import openresolv-3.6.1 with the following changes:
  *  Don't update when nothing has been deleted
  *  Backup resolv.conf to resolv.conf.bak when it doesn't have an openresolv
     signature
     Restore it when the new resolv.conf only has the openresolv signature
  *  Document prepend_search and prepend_nameservers
  *  Implement append_search and append_nameservers
  *  Implement replace and replace_sub to allow for keyword/value/replacement
dhcpcd-6.6.0 has been imported with the following changes:
  *  Log the address IPv4LL defends
  *  PREINIT, UNKNOWN and CARRIER are not either up nor down states
  *  ARP code re-written to allow for many ARP states
  *  IPv4LL address is now pseudo random based on HW address instead
     of really random as per RFC 3927 Section 2.1
  *  If not doing DHCP or DHCP6, disable the DNS requirement in the RA
     to fork.
  *  Treat IPv4LL as fallback and start DHCP discovery even if the prior
     lease was IPv4LL when rebooting.
  *  When we transition from REQUEST to DISCOVER in a reboot,
     start IPv4LL at the same time as discover to ensure we have an
     address quicker.