restart resolvconf via 'service' command

# /etc/init.d/resolvconf restart
Rather than invoking init scripts through /etc/init.d, use the service(8)
utility, e.g. service resolvconf restart

Since the script you are attempting to invoke has been converted to an
Upstart job, you may also use the stop(8) and then start(8) utilities,
e.g. stop resolvconf ; start resolvconf. The restart(8) utility is also available.
resolvconf stop/waiting
resolvconf start/running