Handle overflow of uid or gid in arguments for chown

chown incorrectly allows a uid or gid greater than UID_MAX/GID_MAX respectively.
Using such an argument rolls over to accounts such as root, operator, etc.

Approved by: re (gjb)
Relnotes: yes
Reviewed by: cem, kib
Submitted by: Don Morris <dgmorris@earthlink.net>
Sponsored by: Dell EMC
Differential Revision: https://reviews.freebsd.org/D15119