Remove SC_DFLT_FONT option. vt(4) don't use it.

Suggested by:	emaste
Sponsored by:	The FreeBSD Foundation
Remove unused option.
Fix comment typo in r269052.

Submitted by:	Daniel O'Connor
Add VOP_GETVOBJECT.9 to obsolete files, un-xref.

X-MFC with:	r269160
Correct typo in comment
Fix yet another comment typo in r269052.
Garbage collect couple of unused fields from struct ifaddr:
- ifa_claim_addr() unused since removal of NetAtalk
- ifa_metric seems to be never utilized, always a copy of if_metric
Remove one-time use macros which check for the vnode lifecycle.  More,
some parts of the checks are in fact redundand in the surrounding
code, and it is more clear what the conditions are by direct testing
of the flags.  Two of the three macros were only used in assertions.

In vnlru_free(), all relevant parts of vholdl() were already inlined,
except the increment of v_holdcnt itself.  Do not call vholdl() to do
the increment as well, this allows to make assertions in
vholdl()/vhold() more strict.

In v_incr_usecount(), call vholdl() before incrementing other ref
counters.  The change is no-op, but it makes less surprising to see
the vnode state in debugger if interrupted inside v_incr_usecount().

Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
mdoc: sort sections.
Silence mandoc lint.
mdoc: remove superfluous paragraph macro.
mdoc: fix date.
mdoc: kill EOL whitespace.
Make mmap() of the console device when using ofwfb work like other supported
framebuffer drivers. This lets ofwfb work with xf86-video-scfb and makes
the driver much more generic and less PCI-centric. This changes some
user-visible behavior and will require updates to the xorg-server port
on PowerPC when using ATI graphics cards.
Add a comment and while there, fix trailing whitespace.
- Output a summary of optional VT-x features in dmesg similar to CPU
  features.  If bootverbose is enabled, a detailed list is provided;
  otherwise, a single-line summary is displayed.
- Add read-only sysctls for optional VT-x capabilities used by bhyve
  under a new hw.vmm.vmx.cap node. Move a few exiting sysctls that
  indicate the presence of optional capabilities under this node.

CR:		https://phabric.freebsd.org/D498
Reviewed by:	grehan, neel
MFC after:	1 week
Correct typo in comment

PR:		192231
Submitted by:	Ron Dahlgren
MFC after:	1 week
Remove trailing '.' from See Also section.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Remove trailing comma from standalone Xref.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Remove trailing comma from ending Xref.

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation