we need to test the following scenarios.
1. a jail exists in /etc/jail.conf
2. #1 + a jail in /etc/jail.anotherjail.conf
3. #2 + a jail in /etc/jail.conf.d/yetanother.conf
4. #3 + a jail at one of the jail.conf locations, that depends on another jail
using the "depend" parameter. Read more in jail(8), jail parameters.
5. The above, used with/without "jail_parallel_start=" and/or "jail_reverse_stop=" rc.conf parameters