zephyr_mirror: Include URL for mirroring server.
[program:zmirror-USERNAME]
-command=/home/zulip/zulip/bots/zephyr_mirror_backend.py --root-path=/home/zulip/zulip --user=USERNAME --log-path=/home/zulip/logs/mirror-log-%(program_name)s --use-sessions --session-path=/home/zulip/zephyr_sessions/%(program_name)s --api-key-file=/home/zulip/api-keys/%(program_name)s --ignore-expired-tickets --nagios-path=/home/zulip/mirror_status/%(program_name)s --nagios-class=zulip-mirror-nagios
+command=/home/zulip/zulip/bots/zephyr_mirror_backend.py --root-path=/home/zulip/zulip --user=USERNAME --log-path=/home/zulip/logs/mirror-log-%(program_name)s --use-sessions --session-path=/home/zulip/zephyr_sessions/%(program_name)s --api-key-file=/home/zulip/api-keys/%(program_name)s --ignore-expired-tickets --nagios-path=/home/zulip/mirror_status/%(program_name)s --nagios-class=zulip-mirror-nagios --site=https://zephyr.zulipchat.com
priority=200 ; the relative start priority (default 999)
autostart=true ; start at supervisord start (default: true)
autorestart=true ; whether/when to restart (default: unexpected)
