Remove check forbidding requests that would result in one port being set
to Ethernet and the subsequent port being set to IB.

Submitted by:	Shakar Klein @ Mellanox
Tested by:	Morgan Robertson <morganrobertson@gmail.com>
MFC after:	1 week
Simplify keywords.h generation.
Do not overwrite the new UTF-8 files with the old ISO one
- Add support of MK_INET_SUPPORT=no.
- Fix a bug in sodump() which prevented struct sockaddr_in6 from displaying.
- Fix a bug in in fiboptlist_csv() which could cause free() of uninitialized
  pointer.
- Style cleanups:
 . Add missing "static" keywords.
 . Use an array of struct sockaddr_storage instead of sockunion for rtmsg.
 . Use err() and errx() instead of pair of fprintf(stderr, "...") + exit(1).
 . Use nitems() macro.
 . Various style(9) fixes.
Use NET_RT_DUMP.0.FIB leaf node instead of setting td_proc->p_fibnum.