Plug unnecessary PRS_NEW check in kern_procctl.

pfind does not return processes in such state.
remove/fix old code for building ipfw and dummynet in userspace
fix spelling of DEFAULT in comments...
Allow overspecification of SYSCTL type in external kernel modules.

PR:		194523
MFC after:	3 days
Actually change the USB_PORT_ROOT_RESET_DELAY definition as stated in
the r241987 commit message, instead of having users locally overriding
the value using tunables in /boot/loader.conf .

Found by:	Adam Parco
Discussed with:	Nick Hibma
Document sort_io_queue sysctls/tunables.

MFC after:	1 week
filedesc assert that table size is at least 3 in fdsetugidsafety

Requested by: kib
Untangle iSCSI authentication code by splitting off the CHAP
implementation.

Reviewed by:	mav@
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Whitespace fixes.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Fix ctld(8) to not show the "auth-group <name> not assigned to any target"
warning for auth-groups assigned to a portal-group.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation