Daemonizing solar-worker

Upstart

To daemonize solar-worker on debian or ubuntu upstart script should be used, in script and pre-script stanzas - /etc/default/solar-worker will be sourced, and following variables used:

SOLAR_UID=solar
SOLAR_GID=solar
SOLAR_PIDFILE=/var/opt/solar/solar-worker.pid

Warning

SOLAR_UID and SOLAR_GID should be present in the system.