Document sort_io_queue sysctls/tunables.

MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273457 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
filedesc assert that table size is at least 3 in fdsetugidsafety

Requested by: kib


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273458 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Untangle iSCSI authentication code by splitting off the CHAP
implementation.

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


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273459 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f