Add log level and mount options.

# You can manage the mounting feature. Either "false" or "true". (As a string.)
collabora_online_mount_jail_tree: "true"
# Set the log level. Can be 0 through 8, none or "fatal", "critical", "error",
# "warning", "notice", "information", "debug", "trace".
collabora_online_log_level: warning