* init/control.c:
- control_get_env(): Allow PID 1 environment to be queried for
consistency with control_list_env().
* init/man/initctl.8:
- Added --job, --instance, --global options for list-env, set-env,
get-env, unset-env, reset-env.
- Explain PID 1 limitation for set-env, unset-env, reset-env.