jail: Correctly access IPv[46] addresses of prison_ip
- Fix wrong IPv[46] addresses inherited from parent jail
- Properly restrict the child jail's IPv[46] addresses
Reviewed by: melifaro, glebius
Approved by: kp (mentor)
Fixes: eb8dcdeac22d jail: network epoch protection for IP address lists
Differential Revision: https://reviews.freebsd.org/D37871
Differential Revision: https://reviews.freebsd.org/D37872