Fix some extra whitespace noticed when reviewing git diffs.
Permit MAP_RENAME and MAP_NORESERVE for now.  These flags should be removed, but at least
Chromium and OpenJDK use MAP_NORESERVE.
vt(4): Fix a LOR which occurs during a call to vt_upgrade()

Reported by:	kib@
Review:		https://reviews.freebsd.org/D785
Reviewed by:	ray@
Approved by:	ray@
MFC after:	2 days
vt(4): Use vt_fb_drawrect() and vt_fb_setpixel() in all vt_fb-derivative

Review:		https://reviews.freebsd.org/D789
Reviewed by:	nwhitehorn
Approved by:	nwhitehorn
MFC after:	2 days
Bump __FreeBSD_version after SA-14:19.tcp

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Add proper disable/enable hooks to the default scripts so that this is only
run when asked for by the user.  Right now, hv_kvpd is run on every boot.

Don't do that.

Add hv_kvpd_enable= for this script to be run.

MFC with 271493

MFC after:	2 weeks
Relnotes:	yes
Such typo, many email, very spelling.  wow.

MFC with 271688 271493
Submitted by:	ngie ian
MFC after:	2 weeks
Relnotes:	yes
* Fix if_omcast handling
* Convert if_oerrors to pcpu.

Suggested by:	glebius
MFC after:	2 weeks
Merge remote-tracking branch 'freebsd/master' into hardened/current/segvguard