MFC r266553, r266554:

r266553:
  Add forward-compatibility glue with pkg-1.3:
   - Use ASSUME_ALWAYS_YES=YES instead of ASSUME_ALWAYS_YES=1
     since pkg-1.3 expects "yes" or "true" values.
   - Before exporting PKG_ABI, strip extra characters from what
     is parsed from 'pkg -vv'.  This causes problems further down
     when creating the packages directory for inclusion on the
     dvd1.iso.  Previously PKG_ABI would be 'freebsd:9:x86:64',
     but now is '"freebsd:9:x86:64";' in pkg-1.3.

r266554:
  Disable the main FreeBSD pkg(7) repositories in the dvd
  repository configuration to avoid fetching from upstream
  in case there may be conflicts.

Sponsored by:	The FreeBSD Foundation
MFC r265798, r265815, r266091

Add a man page for the new vt.4 device.
MFC r262329:
Define the KM_NORMALPRI flag for kmem_alloc(), as it is used in some
upstream DTrace code.

MFC r262330:
1452 DTrace buffer autoscaling should be less violent

illumos/illumos-gate@6fb4854bed54ce82bd8610896b64ddebcd4af706
MFC r266541:

- Fix a bug where the TLBPC value was forced to being odd for IN
direction isochronous transfers.
- Remove setting of fields which does not belong to the respective
TRBs. These fields are currently set as zero and this is more a
cosmetic change.
MFC r265900:

Repair some races in IPI handling:
1. Make sure IPI mask is set before sending the IPI
2. Operate atomically on PS3 PIC outstanding interrupt list
3. Make sure IPIs are EOI'ed before, not after, processing. Without this,
   a second IPI could be sent partway through processing the first one,
   get erroneously acknowledge by the EOI to the first, and be lost. In
   particular in the case of smp_rendezvous(), this can be fatal.

In combination, this makes the PS3 boot SMP again. It probably also fixes
some latent bugs elsewhere.
MFC r266399:
  Since ipfw nat configures all options in one step, we should set all bits
  in the mask when calling LibAliasSetMode() to properly clear unneeded
  options.

  PR:		189655
MFC r266445:
  Add a topology trace to the g_spoil_event.
Catch up supported hardware obmitted in r265269, now that this branch has support
for it.
MFC: Merge sendmail 8.14.9 to HEAD
MFC: Update for sendmail 8.14.9 import
MFC: Minor changes to force commit these files so new freebsd*.cf files are
     built to use the new sendmail-8.14.9/cf tree.
Note merge for sendmail 8.14.9.