Mark functions inet_netof(), inet_lnaof(), and inet_makeaddr() as
deprecated, as they assume Class A/B/C. inet_makeaddr() mostly works
when networks are a multiple of 8 bits, but warn for anything other
than historical classes. Reduce other mentions of network classes.
MFC after: 1 month
Reviewed by: bcr, #manpages
Differential Revision: https://reviews.freebsd.org/D32711
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.
Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96
