Move StartLimitIntervalSec from Unit to Service in service files
Also, rename the variable to StartLimitInterval
Source: https://dev.arvados.org/issues/12720 Service → StartLimitInterval (versions up to 219, incl. ubuntu:trusty) Unit → StartLimitInterval (version 229, incl. ubuntu:xenial) Unit → StartLimitIntervalSec (version 230+)
CoD is running systemd 219