Import openresolv-3.6.0 with the following changes:

  *  dnsmasq subscriber no longer moans if it hasn't written a pidfile
  *  Ensure that name_server_blacklist works for more than one option.
     Thanks to Frederic Barthelery.
  *  unbound_insecure can disable DNSSEC for all domains processed.
  *  local_nameservers now defaults to
     127.* 0.0.0.0 255.255.255.255 ::1
     and is used instead of a hard coded list.
  *  Allow the disabling of resolvconf or optionally an individual
     subscriber.
  *  Don't wait around trying to create a lock if we don't have
     permission.
  *  resolv_conf_passthrough=NULL will update resolv.conf to match
     only what is configured in resolvconf.conf and ignore any
     interface configuration.