MFC r363284-r363285, r363452, r363670

MFC r363284-r363285, r363452, r363670

r363284:
pfil_run_hooks() can be called recursively, so we have to
define FASTROUTE_RECURSION in fil.c

Submitted by:	christos@NetBSD.org
Reported by:	christos@NetBSD.org
Obtained from:	NetBSD r1.31

r363285:
Fix incorrect byte order in ipfstat -f output.
- make sure frag is initialized to 0
- initialize ipfr_p field

NetBSD PR:	55137
Submitted by:	christos@NetBSD.org
Reported by:	christos@NetBSD.org
Obtained from:	NetBSD fil.c r1.32, ip_frag.c r1.8

r363452:
Load ipfilter, ipnat, and ippool rules, and start ipmon in a vnet jail.

PR:		248109
Reported by:	joeb1@a1poweruser.com

r363670:
Continued ipfilter #ifdef cleanup. The r343701 log entry contains a
complete description.