Add supervisor to run-lokole.sh

[c-w]

Currently we're using Bash process monitoring to supervise the various parts of the Lokole client application that run in Docker:

lokole/docker/client/run-lokole.sh

Lines 14 to 36 in 79a8a9d

	"${scriptdir}/run-celery.sh" &
	celery_pid="$!"
	"${scriptdir}/run-crontab.sh" &
	crontab_pid="$!"
	"${scriptdir}/run-gunicorn.sh" &
	gunicorn_pid="$!"
	while :; do
	if [[ ! -e "/proc/${celery_pid}" ]]; then
	echo "celery crashed" >&2
	exit 1
	elif [[ ! -e "/proc/${crontab_pid}" ]]; then
	echo "crontab crashed" >&2
	exit 2
	elif [[ ! -e "/proc/${gunicorn_pid}" ]]; then
	echo "gunicorn crashed" >&2
	exit 3
	else
	sleep 10
	fi
	done

We should replace this with supervisord so that the Dockerized runtime is consistent with the runtime set up by install.py.

Note that supervisord isolates environment variables so we'll need to ensure that all LOKOLE_ and OPWEN_ environment variables in the Docker environment are correctly passed down to the supervisor processes.