Pull up following revision(s) (requested by tls in ticket #173):
	doc/CHANGES: revision 1.2004
	sys/sys/rnd.h: revision 1.43
	sys/kern/kern_rndq.c: revision 1.28
	sys/kern/kern_rndsink.c: revision 1.10
	sys/dev/rndpseudo.c: revision 1.23
Fixes and enhancements for polled entropy sources:
	Add explicit enable/disable hooks for callout-driven sources (be more
	power friendly).
	Make "skew" source polled so it runs only when there is entropy
	demand.
	Adjust entropy collection from polled sources so it's processed
	sooner.
Backout previous
Redo previous in the right location
Pull up following revision(s) (requested by tls in ticket #174):
	doc/CHANGES: revision 1.2005
	sys/dev/pci/viornd.c: revision 1.1
	sys/dev/pci/files.pci: revision 1.372
	sys/arch/amd64/conf/GENERIC: revision 1.401
	share/man/man4/viornd.4: revision 1.1
Add viornd(4), a driver for the VirtIO entropy source available on
QEMU, KVM, and Google Compute Engine.  From OpenBSD.
Pull up following revision(s) (requested by tls in ticket #175):
	share/man/man4/Makefile: revision 1.618
	distrib/sets/lists/man/mi: revision 1.1488
Build and install virtio(4) manual page - missed in previous commit.
Pull up following revision(s) (requested by tls in ticket #176):
	share/man/man4/viornd.4: revision 1.2
Use proper markup in AUTHORS, and sort SEE ALSO.
Tickets #173 - #176
Pullup arcofi(4) changes entry missed in previous handling of Ticket #62.