share/man/man5: Use MANGROUPS.yes

Simplify the Makefile logic by using MANGROUPS.yes for optional
packages. Also, move bluetooth manpages to the correct package,
add the correct conditional for OpenSSH (MK_OPENSSH), and properly
alphabetise the file.

MFC after: 3 days
Reviewed by: emaste
Sponsored by: https://www.patreon.com/bsdivy
Differential Revision: https://reviews.freebsd.org/D53127