CAVALCADE_JOB_ID and DOING_CRON constants are defined at a very advanced stage of execution

Hey, this is Luca from FFX. Our paths cross again =)

I can see both `CAVALCADE_JOB_ID` and `DOING_CRON` constants are defined in Command::run() just before the actual execution of the scheduled hook.

That means I cannot access them during, say, any `init` or `admin_init` hook.